Why Not to Change Your Car's Muffler

[@scottykilmer]

⬇️Scotty’s Top DIY Tools: 1. Bluetooth Scan Tool: amzn.to/2nfvmaD 2. Cheap Scan Tool: amzn.to/2D8Tvae 3. Professional Socket Set: amzn.to/2Bzmccg 4. Wrench Set: amzn.to/2kmBaOU 5. No Charging Required Car Jump Starter: amzn.to/2CthnUU 6. Battery Pack Car Jump Starter: amzn.to/2nrc6qR 🛠Check out my Garage to see what I use every day and highly recommend: www.amazon.com/shop/scottykilmer ► Subscribe and hit the notification bell for all new videos: kzbin.info Scotty on Social: Facebook ► facebook.com/scottymechanic/ Instagram ► instagram.com/scotty_the_mechanic/ Twitter ► twitter.com/Scottymechanic?lang=en

[@user-yv7zs7ne7x]

luke saylor I agree

[@dominicanbiker]

Scotty Kilmer what if someone stole your whole exhaust system and I wanted to put a new system with flowmaster 40

[@tommyw7]

Scotty, please bring back the "1, 2, 3, 4, fire up your engine" intro at the beginning of each video!!!!

[@snider2588]

Scotty i appreciate the link to Amazon about all the tools you use

[@jonathansanchez6952]

Scotty Kilmer thats why you tune the car DUH

[@scorpionwins6378]

Scotty's wife's Lexus= 42db Scotty's motorcycle= 110db Scotty's speaking voice= 190db

[@low87dawg86]

Mistah J he needs a muffler

[@anthonyr.hodgson9988]

Lol, remember non offensive comment.

[@thefishingplace6071]

More like 210db

[@KevinWilliams19723]

See, without the Muffler, he's loud and doesn't run right :D

[@lees.4084]

Mistah J Now that's funny...

[@tym6218]

One acid trip in the 60s and Scotty has been riding the wave ever since

[@coydog7902]

C a t c h t h e w a v e

[@davkhr]

ty m LMAO

[@aaronfregoso8845]

😂

[@davkhr]

ty m acid was way more potent back in the 60s

[@duarte9448]

ty m lmao

[@craterrr]

I was really thinking on putting a performance exhaust system on my car, and then I watched this video. Still gonna do it

[@user-ti3sg9un9m]

😂😂😂

[@mkb_344]

Agreed

[@kotaman232]

Just tune it like he said.

[@flute136]

@@kotaman232 tune it HOW though?

[@itz_evil1653]

@@flute136 get it tuning by a tuner

[@bpheta]

Thanks Scotty... im going to remove my muffler now

[@markchatten9484]

🤣👍

[@wowed1659]

Same😂

[@zefiraskaunas395]

Me 3

[@williamguenther]

Exactly what I was thinking

[@algretatum5045]

Facts 😂😂😂

[@Sakezaf]

No muffler: 110dB, Scotty talking: OVER 9000!

[@MohdAzylee]

Levente Fazekas hhahah hes good

[@BOSKILLZX]

Loooooool

[@onemanarmyEST]

It must've taken a team of engineers to create the voice of Scotty Kilmer, he runs his mouth very loudly yet efficiently.

[@tank0military]

Levente Fazekas 8753 14th565887800997 poo o877422 wer timeuo know c CVS l

[@dmerced257]

haaa haaa!!!!!!!!!!!

[@lemixxradiolemix871]

Rev your Engines, but quietly..

[@elijahcormier5239]

LemixXRadio Lemix Rev them up? Or down?

[@omegarex909]

Lol

[@LegendStormcrow]

Rev your Engines, unless you drive a ricer bumblebee.

[@tjjavier]

Hahahaha!!! 😂

[@SHOTS-FIRED]

Dont forget to quietly ring that bell🔕

[@nelsonrodriguez2522]

Watched this video yesterday. Installed a muffler today.

[@zomclownttv]

Lmao

[@tylersk8s51]

Bouta install one aswell😂

[@lrvr21]

as long as scotty doesnt know

[@sarthakmohapatra3738]

Idiots percieve the world in an absurd way.

[@fredcole2683]

I watched it after doing mine yesterday lol

[@DanPellegrino486]

Imagine living near this guy? "Yeah honey, he's outside yelling at the camera again. I don't know he's revving up a motorcycle now? He's yelling more and waving his arms.

[@NipponNostalgicTV]

HAHAHAHAHA

[@jordanbuscema2719]

YES

[@jenw6009]

Lmao

[@MFP2241]

Yeah he should get a muffler for that mouth of his... or a tune.

[@sgiiiz9513]

Lol Bernie Sanders

[@888TopGear888]

And then theres Scotty, who talks at 130 decibels.

[@raymondlualhati3978]

Lol

[@SSGSPEEDMAN]

888TopGear888 hahahhahahahhaahahah love it

[@roycejohnson8189]

888TopGear888 " Screaming- "REV YER ENGINES!!!!!"

[@2R1V3R]

CryptoHick 😂😂😂😂

[@sgthoon7780]

😂😂

[@tyjones6568]

This guy doesn’t want us to do anything with our cars 😂

[@robertoayala809]

🤣

[@johnharriel4485]

Rip your cats out man, they just the governments excuse to screw up gas flow. Do it man!

[@jogmas12]

Ty Jones dude, just buy an old car!

[@s.s.divakar7911]

This guy says correctly

[@Munted1.4L]

I mean, he does make it clear that we need to get a tune. That goes for any mod that relates to fuel or air. Intakes, exhaust and such all need a tune afterwards to get the most out of the particular mod.

[@mariofalz]

Next video: Why not to buy a car

[@richardwhitaker4148]

mariofalz I'm dead. That is tooo funnyyyyy 😆😆😆🤣💀💀💀💀

[@yamaha94O]

XD

[@banker7308]

Next video why not to put gass in your car

[@JH-jm8ib]

Next video. Why not to piss off a police officer. Don’t speed and don’t mod your car illegally

[@banker7308]

Why not to clean your car 😂😂😂

[@Jezzz9]

With every mod I research or stumble across… this guy is always there to tell us not to 😂 He probably has a point a lot of the time but what a buzz kill!

[@benc2324]

He has absolutely no idea what he is talking about.

[@felixtavarez7769]

He really is there every time I search a mod.

[@heberaviles932]

He’s just telling you to do it properly

[@mendocinorider]

Rev up your stock mufflers!!

[@wilfishy4381]

Haha

[@derrekspeck3417]

Hahaha

[@christrealg934]

🤣🤣🤣

[@imoral2348]

Javier Roman 😂😂😂

[@956HOUSE]

💀💀💀💀💀💀💀😂😂😂😂

[@spoon_thumbs]

I hear you loud and clear Scotty **saws off muffler**

[@adamlummis7519]

Oh my god I died when you said this 😂😂😂💀

[@dontknow2419]

spends 700 on a magnaflow

[@Nigriff]

Scotty is louder than my straight pipes

[@King88_8]

Scotty, youre loud, you need a muffler...😆😆😆

[@GianniEndo]

King that's hilarious!

[@mysticreign3057]

King Yes!

[@horseplop9]

lol that's funny

[@Bandit-Darville]

No, because he's tuned to perfection!

[@janiyanethmaweerasinghe512]

Stock muffler was removed from him, free flow pipe isn't programmed well that's why it's revving Soo much😂😂

[@mcintosh.motors]

Really depends on the car.. most newish cars’ ECU can adapt to air flow changes such as a full catback exhaust. Changing out cats though can be a different story

[@jaskajokunen3716]

Removing cat usually causes the car to run slightly richer but not much. The rear o2 sensor doesn't really affect it that much.

[@johnponce8759]

Check engine light should not appear as long as the catalac converter isnt messed with

[@TheSMARTREY]

i removed mine and no check engine lights comes up, had my catback custom made by a philippine racing team. so it's not always the case

[@renechimborazo7166]

@Camaro SS what about when you need to pass inspection

[@zolttech3907]

rene chimborazo it won’t pass

[@buschg7106]

Yep

[@Officertack]

Bullshit. it comes on if you change the air intake as well

[@Jaylay-2390]

Pretty much he is saying tune car after exhaust....

[@SI0AX]

That is the perfect advice. Tune your car after any mod that changes engine performance. Even a damn intake. You otherwise wont get any benefit from it, and like he said, it will most likely make the engine run bad. I once installed a 3" intake when stock was 2.75". The check engine light came on with 2 codes. 1 code was about running too rich, the other code was about running to lean. So the tune was pretty much completely screwed up. Since I did my research, I had the ECU tuning software *before* I even changed the intake, so I was able to calibrate the MAF sensor and adjust the A/F ratio.

[@konnj]

Opening the exhaust will decrease engine power loss at the exhaust stroke and sends that lost torque to the crankshaft. This will not really change how the engine operates just makes it easier for it to work so less power is lost. 99% of modern engines have self-adjusting ECU set to certain parameters mostly based on airflow, it's not until you change the AFR mixtures or timing that you need to tune the engine, not that you can't get any more power out of the engine with a tune however, factories tend to mass produce engines and ECU's, not really tuning them for each individual engine. Making it easier for the engine to work, like putting on a less restrictive air-intake or less restrictive exhaust does not generally require tuning because engines are tuned on a engine dyno without any air or exhaust restriction.

[@letsroll2463]

It all depends on the car, it is true if you want the full benefit of the mod that u will need a tune to go along with it. However, not all cars are universal I was able to get 40whp on full bolt ons with no tune NO troubleshoot codes. The video and commenters is vaguely describing mods as a whole, but after that 40whp turned into nearly more than double with a tune cycling through after awhile. Tunes do benefit turbo cars a lot though increasing the turbos output to the maximum psi factory limits on stock parts, but may risk the engine depending on the car. I do not even care about loudness so he is pretty much generalizing as i prefer to have it on the low, which is why i was kind of hesitant in changing the headers cause it does increase it ten-fold. However, with the mods i do get faster times and/or better gas mileage depending on how i drive it.

[@bisterkding9249]

Bjorn, that's not true. There are numerous forums full of people warning that they have actually lost performance after installing a simple performance-oriented cold air intake. They were able to trace the problem back to the engine's air sensors- the wider intake ducts changed the density of and rate at which the air flowed into the engine, throwing off the air/fuel ratio.

[@Adam2050]

Its a rant.

[@Monkeyseemonkey79]

I wish Scotty would speak up. I can barely hear him.

[@aaronarevalo6512]

dead lol

[@naphtaliobanor1454]

Maybe if Scotty removes his vocal muffler and straight pipes his vocal chords, you can hear him better

[@goosebee]

Lmao 🤣🤣

[@saltycade9063]

Tom Wetz it’s a joke...

[@EZ4U2Say11]

Take your muffler off then you can hear him

[@captainkangaroo4301]

My muffler has a hole in it and according to Scotty I shouldn’t change the muffler so I guess my only alternative is to cram his pinhead into the hole and snap it off. Thanks for the advice Scotty.

[@_AlejandroGonzalez_]

Was looking for a louder exhaust for my truck, found this video instead. Still looking for a louder exhaust

[@jamesslossar3865]

Alejandro Gonzalez what exhaust did you end up going with

[@zachwagner1517]

Alejandro Gonzalez I got a flow master on mine

[@jeezus1288]

I’m with you brother 😂

[@tonyboyd3783]

Alejandro Gonzalez 😂😂😂😂😂

[@hydeist0666]

Im going for a greddy chambered muffler. Is that a good obe for bone stock engine?

[@autohelix]

Too late I put a Cat-Back exhaust on everything I own.

[@landongarner9643]

Ford ST same.

[@soberstoner1152]

Too bad you own a Ford

[@landongarner9643]

No Name I don't own a Ford.

[@autohelix]

No Name Too bad you don't.

[@sourwords1808]

Ford ST not all of us are kids.

[@honk3x]

This guy is that grandpa that tells you to keep your car all stock straight from the dealership 🤦🏻‍♂️😂

[@simdoran8516]

A car is actually worth less when you modify it from original spec.

[@honk3x]

Sim Doran yeah if you return it to the dealership.

[@Sloimer]

@@simdoran8516 And?

[@mrjpz]

@@simdoran8516 that's not true at all actually havent you heard of 100k supras?

[@fordshuler1525]

@@simdoran8516 depends on what it is, if you bulletproof a 6.0L it'll sell for more because you've fixed all the issues that it had at original spec 👽

[@trickmiller8169]

I bought a car with no muffler. The guy lowered the car and something ripped it off while he was driving. It had a resonator on it and that was it. I installed a whole exhaust system and it made it louder.

[@ThreadsOfTime1201]

Paused video to comment before watching. Let me guess..... Scotty does his thing where he goes "the engineers of the vehicle knew what they were doing" UPDATE: I was right

[@WeekendWarrior604]

Nailed it! 😂👍

[@reaganharder1480]

The problem with that argument is that the engineers who designed the thing were concerning themselves with a lot of factors many car guys just don't car about. Like being quiet, for example.

[@jesusislord4060]

@@reaganharder1480 True. The engineers had to design the exhaust system with emissions in mind but where I live has no emission laws so it's okay to remove all this restricting crap.

[@johnchandler1687]

When you go to free flowing exhaust you may gain top end horsepower, but you lose torque in lower RPM range. Not a concern with a hotrod, but if you really use your truck for working and hauling torque is more important. Also, a builder of performance engines tried changing the valve angles. Found that going from standard 45 degree to 35 degree lost approximately 5% of horsepower, but gained over 10% torque. Torque is what makes vehicles go. More horses at 4000 RPM doesn't do you any good in normal driving unless you're passing some one. If you just want loud install cutouts and go whole hog.

[@tluva1020]

Let me guess, you watched it, and then edited it..... Yep, I was right

[@notacop_yt]

Scotty complains about every modification. He should just drive a stock Prius 😂

[@baranUtube]

High Diamond exactly, this fckn guy.

[@notacop_yt]

BooostedGTI 😂😂

[@ej_tech]

He drives an old Celica. A Prius has added complexity. Complexity he doesn't want to deal with.

[@dirtycommtroop]

Scotty is absolutely right though. A lot of people put in new intakes and mufflers but they don't get it tuned. You need to tune it!

[@nashvilleoutlaw]

Derek K i put a flowmaster on my truck 15 years ago and never got it tuned. I did get an extra 2mpg better fuel economy though.

[@madmotorrepair1748]

Loud Pipes Saves Lives

[@brianshaggy]

Mad Motor Repair only for motorcycles, can't be said about cars when you're on a steel cage and you're not almost invisible to old grannies and texting teenagers on thier 3000lbs bullet vehicles, the only reason a car should be loud is because it's fast, i hate seeing 200hp cars sound like uther garbage

[@suckmydingledong]

BrianShaggy074 you know you can barely hear them until they pass you anyways

[@Chubbycat747]

There are no scientific studies to back up your claim. Loud pipes are for obnoxious douchebags.

[@brianshaggy]

Captain Shark you know there's no scientific studies to back up your claim, loud pipes save lives

[@brianshaggy]

JulmustKebab but you can hear us when we're around you, it should be loud enough to were i let you know I'm next to you but not too loud to wake a whole neighborhood up

[@hunterskeens2642]

Changed my muffler bout 7 months ago. Still no check engine light. Still runs fine. And sounds great. Plus my O2 sensors are before my muffler so its not messing up anything with the computer cause its stock until the muffler

[@pyroaficionado867]

Now the teenage honda drivers are TRIGGEREDDDDDD

[@claudedottin1312]

Pyro Aficionado lol mine is tuned

[@DeadlyBrianX]

Pyro Aficionado See I drive an accord with VTEC stickers and vortex fins on top. This was my next plan but poppa scotty always there for us.

[@claudedottin1312]

DeadlyBrianX if you know what vortex generators work they may or may not work on your car to work with a spoiler and depending on the downforce generated on your car

[@DeadlyBrianX]

Claude Dottin No I meant changing the muffler was my next plan. My Ricer build is what I told you and it works so well.

[@Hikojiro]

Why Honda?

[@DazTheMe]

Legend has it that Scotty tried to measure how many decibels his intro was and the sound metre just showed "Error"

[@andyamysarizonaadventures5450]

Watched this the day a shop is installing a flowmaster outlaw on my truck

[@TheJoe999Man]

Scotty just burned ricer kids low key

[@xXMetalforever1994Xx]

Sir Brellin this is only for "modern" cars, ricers often don't drive "modern" cars.

[@JeepTJWheelin]

Sir Brellin Well someone had to. Ricers with farts cans should be taken off the road permanently.

[@mean3g161]

Sorry but a new exhaust system is a performance mod not a cosmetic enhancement.

[@TestAndTune]

2JZ FTW its actually both

[@alphatrion100]

Modern cars meaning 90's and newer. Carburators started disapearing in the 80's

[@garymason2815]

Most ECU figure out the new airflow pretty quick and compensate for it loud pipes save lives

[@missingremote4388]

Need at least a Rez ( resonator muffler )

[@eduardodiaz5762]

It does save lives, better acceleration response as well to Swerve the haters 😁

[@inbredjesus9188]

@Philip Turner my muffler fell off, I get the funny type of attention which I find funny

[@Levi-qb2uf]

@Philip Turner you say that like you were never young

[@ariskaitamialastakagela9187]

Yes..... actually new exhausts like that give you more horses on higher rpm by taking those horses from lower or the opposite,so scotty is wrong

[@gmugrumbach]

The sobbing girl cartoon for the "sensitive" system hahahaha! Oh Scotty.

[@paulsaik2282]

Scotty, I have a 2010 Toyota Corolla le 4 cylinder 1.8 liter engine at 137,000 miles. The driver side engine air intake resonator fell out of it. That’s what I was told when I bought it for 3900.00 Should I replace the resonator or will it run fine without it?

[@jesusislord4060]

How is it running?

[@paulsaik2282]

Drives like a dream.

[@slammedek9458]

Basically dont even put a sticker on your car because he'll have a reason why 😂

[@OverlandOne]

Stickers on your car, especially the ones like STP, can mess with your computer and throw off the air/fuel ratio giving you even worse performance than you had before putting that sticker on. Also, stickers are illegal in some states and your car will fail inspection. The engineers that designed your car did not design it to run correctly with stickers.

[@pxndxlunx5821]

@@OverlandOne and that's getting scott free, if you have bad luck, those stickers will decrease your hp and even kill the engine. They wear out the valves and the pistons real fast.

[@biguwus9773]

@@pxndxlunx5821 Scott Free

[@jordansheppard6643]

it can mess with ur paint

[@Imakebootysclap]

I got floor mats for my 2016 forte5, Scotty was not pleased, came up with a reason why that would fry my piston rings at 80k miles and void my warranty :P

[@DreamHachi]

My 67 Chevy had a flow master on it but, it fell off somewhere. Hello straight pipes

[@frankjdm4636]

Lol

[@stevebbkny2394]

Best comment yet

[@cdshawn]

Cracked Egg .....I hear you, Player!!

[@justinl9677]

I hate it when my mufflers "fall off"! It seemed to happen to every truck I ever owned from age 16 until my late 20's. It always happened about the same time too, right after I got it...weirdest thing Ive ever seen! ;)

[@anthonyrodriguez1953]

Hello flow masters muffler

[@cullenmcnamara5518]

Watched this video yesterday, today took my mufflers off car sounds fantastic runs better no engine lights 👨🏼‍🔧

[@silverrain99205]

Mechanik

[@jesusislord4060]

Honestly its only okay to remove your muffler if you tune your car to compensate for more air flow or else like Scotty said it will run worse as there is less fuel than air.

[@SpookyDaScary59]

@@jesusislord4060 recommended for 90+ 110 octane cars unless you want to smell like rotten eggs everywhere you pull up

[@jesusislord4060]

@@SpookyDaScary59 Wdym? Why?

[@SpookyDaScary59]

@@jesusislord4060 high octane burns off almost 100% so you won’t need muffler or cat, but my Ford will stink the place up on unleaded

[@muaythai193]

You can change the exhaust without making it louder. For example install a true dual no crossover exhaust on a V8, and install two separate cats and two separate mufflers. That way your car didn’t get louder but it sounds much nicer because of the uneven firing V8 shining and showing it’s real character. 👌

[@austinbishop7430]

I approve as a V8 owner. Most Ford come with true dual with H pipe.

[@muaythai193]

@@austinbishop7430 for sound AND performance, h-pipe is the way to go. 👍

[@robmen1402]

I mean his main concern isn't the sound but more that he claims that it ends up making your car actually run worse, not better.

[@muaythai193]

@@robmen1402 That’s incorrect though.

[@JackSadler]

this video should be shown in schools across the world.. :P

[@nsx1075]

Jack Sadler couldn't agree more

[@jimmysapien9961]

Hell yea why no

[@majidaskari8306]

here you can see an example of someone who removed the muffler and disliked the video.

[@Cliffjumper]

"Modern cars are very sensitive" Shows girl crying🤣🤣🤣 I love your humor Scotty🍻

[@bearing_aficionado]

Cliffjumper that was savage on his part. Too bad he didn't show a crying ass liberal dude with pink hair and wearing a dress.

[@earlibee]

"Polution" someone farting lol

[@alainaguilar9938]

Ryan Bond don't you mean most conservatives?

[@bearing_aficionado]

Alain aguilar, um no. Since when do you see conservative guys with pink hair and wearing a dresses now do you?

[@Godzukidan]

How are they going to hear us rev our engine's with stock mufflers. 🚘🙉

[@dandearman2871]

I think watching the tires smoke is more impressive than listening to the engine rev.

[@universalmind7007]

Exactly lol I just installed a exhaust system on my mazda 6 and I think it drives more aggressive

[@lordcxm_7th747]

😂😂😂😂 I’m crying 😭

[@lordcxm_7th747]

Straight pipe lifestyle 😁

[@streetcargarage5743]

Godzukidan 😎😎 I agree

[@gamercat7004]

What about just the cat back changed only for a 2017 Honda civic hatchback would that affect performance?

[@jesusislord4060]

I would remove the cat a guy here on KZbin dynoed a supra with and without a cat. Without a cat he got +10 hp everytime.

[@billthompson5644]

I love that little no farting symbol, that was kind of funny.

[@reeewhydoihavetochangethese]

Got a laugh out of that too, Scotty's the man

[@squidwardshouse67]

Kind of? That was hilarious 😂

[@ChristyOFaghan]

i liked the one of a crying kid that appeared when he talked about the fuel ratio sensors being 'very sensitive'

[@BigBarnV1]

I liked that one and the girl crying

[@wowomg1980]

lol Indeed

[@liambryant5150]

I like how he makes tuning your engine sound more complicated than it is

[@davidridley51823]

But to normies tuning is basically black magic😂

[@Jessehermansonphoto]

Real tuning is.

[@senorbonbon]

@@davidridley51823 noob question, So tuning is the move then changing the exhaust

[@ArcYT]

@@davidridley51823 yes

[@shaneomac5074]

Tuning is incredibly complicated, that’s why a lot of professional tuners specialize in one type of car because it’s so complicated, it’s not like adjusting an old carburetor

[@never0ps937]

" people talk loud when they want to sound smart right" - Squidward

[@julianbennett4088]

neVer0ps “CORRECT” -Sheldon J Plankton

[@TheHuskyK9]

Except he knows what he's talking about. He just doesn't recommend it

[@goosebee]

Ahahahaaaa 😂😂😭😂💛

[@JosiahAndrewNavarro]

Imagine being a Nissan lover! Lol

[@parvariramin]

‏Thanks for the great video, I put a gasket on the connection between the muffler and the exhaust pipe for a better sound. It can be said that this part of the exhaust is leaking now, will it damage the car engine in the long run or not?

[@sfg77dfjuhfg89]

I like the throaty sound and smoother acceleration in power of my Magnaflow performance exhaust system.

[@MICKEY4356]

Nothing like a pair of Cherry Bomb mufflers on a V8 engine.

[@piratepete-thetruthisforevery1]

Yup, I had that set up plus headers on my 340 Duster... Thumbs up!👍🏼

[@docholiday9786]

I just added a cherry bomb on my 2014 Silverado and now I'm getting a slight rough idle

[@y.bowcat7782]

this is the most boomer comment I've ever seen

[@gmax341]

I want to either straight pipe or cherry bomb the muffler area but after a call to a shop I had work done at years ago, sadly I was advised against it. He claimed that I would lose performance especially during towing situations. Now I'm frustrated...

[@tomsteere8904]

I had a 1979 monte carlo with a built 350 and put some old school glass packs from the 70's on it. That thing sounded awesome. One of the best sounding cars I've owned.

[@0669249]

Scotty, you're too old for this. Take a breath while you realise modern ECU's are perfectly able to re-tune themself to new AFR after MINOR mods like catbacks and intakes

[@TeeroyHammermill]

>Korben Dallas: You do realize that ECU's are programmed to be in compliance with EPA guidelines don't you? It'll retune to stay in compliance, usually resulting in a leaner running engine.

[@0669249]

@@TeeroyHammermill yes I know, hence why I said MINOR mods. Some ECU got more latitude than others and I think it's simplistic to say that every mods will harm every car lol.

[@zacharyriley4122]

Korben Dallas can you tell me where scotty said “every mod will harm every car” or any equivalent statement? i heard him say that these mods were bad to do if done improperly and without tuning, but i missed the blanket statements...

[@jeremiahginter1892]

Paul Daniel m

[@albok7942]

what if you have a valvetronic exhaust that you can turn it on for loud or off for normal?

[@robstaylor4234]

if you want to change the muffler for a free flowing..where do you go to get it tuned right?

[@Fat091587]

I cant agree with him, doing a full exhaust and the right tune does have a significant difference

[@danielgrantland6889]

Fat091587 If you watched it fully he says about having it tuned top specific exhaust backpressures but that to many don't put the time into it.

[@HeyImGaminOverHere]

He didn't talk about back pressure, he spoke of flow rates. Internet argument ENGAGE!!!

[@MeanGreenSmashingMan]

Doing some exhaust work on mine too. Factory exhaust is too restrictive for all the other mods I've done lately. Loving the supercharger whine but wanna hear it roar from the back too you know.

[@nanothestrange]

keyword right tune. most inexperienced people don't tune anything to compensate for the pressure change

[@13littlelazy]

Fat091587 learn to listen idiot.

[@Nick_Ramirez]

Got an FRS, chopped that muffler off the first day and put on a custom y pipe. nO rAgReTs

[@j_mza]

niickram not even a single letter?

[@eurosonly]

Did you have a stroke at the end there?

[@SI0AX]

Tune the car... althought it's probably not necessary since the ECU can adjust for like +-10% I think.

[@perfecz5548]

Your first mistake was buying an frs

[@shaggymason8415]

Who modifies a Scion?

[@jeandufresne9225]

If I wanted a quiet car. I would have got a prius. I do it cause I want my car to play the song of it's people.

[@gooz0mbie]

jean dufresne if you have a Honda I swear...

[@jeandufresne9225]

I don't. lol But I wish I did because they are cheap and easy to modify. If you ever have spare time, check out boostedboiz channel on KZbin.

[@gooz0mbie]

jean dufresne they are garbage cars. I’ve seen that channel

[@jeandufresne9225]

gooz0mbie Why do you think they are garbage?

[@Zordy21]

I may not be a fan of Honda's but they are far from junk. IMO Honda's are better than Toyota because they last forever but they aren't insanely expensive to repair

[@CopsNArms]

Can I take the muffler off of my 1991 GMC Sierra 2500 or will this cause issues with my truck?

[@jesusislord4060]

Have you took it off? You could do a test run. I imagine it would run a little better.

[@Kodiak97x]

Invalid, my 5 cylinder needs to sound like a rally car

[@geckog35]

SGKatrox lol Audi Quattro sounds

[@bmoore7402]

Hypesoul so what your saying is you want a camaro that doesnt blow head gaskets?

[@zebrahead32199]

indeed

[@glennjunipermarshall531]

I'm fine with changing the exhaust but make sure that it's not a fartcan.

[@Kodiak97x]

Next video: “Why cars shouldn’t be fun”

[@LrulestheworldM8]

SGKatrox "why modern cars aren't as fun as 90s cars"

[@kerwinwade1884]

Lol

[@JBizkit85]

"Why the only car you should own is a bone stock mid 90s Toyota Celica"

[@losdayz2894]

Jesse Westover lmao

[@NumbaOne]

you have to tune your exhaust then it would be fine to change it but if you dont tune it it will be just like he said in the video

[@austinament7647]

This guy has me convinced he’s all about stock cars (which isn’t a bad thing)

[@maximilianohuezo6292]

So you are telling me to straight pipe my 1997 Toyota Celica?

[@peaceofmind471]

No ... nobody wants to hear a lawn mower passing by

[@therealronaldd]

PeaceOfMind you’re thinking of Honda’s

[@4NDR3WSCHANNEL]

PeaceOfMind what? Dude I think you’re talking abut ricer Honda’s

[@peaceofmind471]

geckOS no every 4 cylinder car

[@WhyteLis21]

PeaceOfMind tell that to motorcyclists bike. 😁

[@TTime685]

But don't modern CPUs compensate for minor modifications like an intake or muffler by automatically adjusting the fuel ratio?

[@TTime685]

ECU *

[@gbales84]

In closed loop fueling yes. Aka when you are not putting the pedal to the floor. His info about changing a muffler or catalytic converter affecting the tuning of the car is wrong too. The 02 sensors before and after the converter only are there to sense if the converter is doing its job of cleaning the exhaust. If you put headers on a car, that is the only real time a change in the exhaust would warrant a tune. That is because the headers come before the narrowband 02 sensors..which are before the catalytic converter 02s and the narrowbands affect closed loop fueling.

[@666madmal]

Changed mufflers changed air filter Re jet carb Runs smoothly no detonation Perfect!!👍👍👍

[@noahleonhardtproductions2808]

Mr Scotty, the computer programming is called tuning and a lot of the kids on the streets with the Japanese cars tune their cars to run just right and frankly pretty fast and loud

[@corpsie666]

New vehicles can easily compensate for the minor difference in backpressure from a different muffler. They're also so far away from the post cat O2 sensor that it won't be a problem. im1ne FYI

[@xelasehguh]

♥

[@bigkarl24]

Pretty much any car ob2 and ob1 if it’s a cat back the mpg will not change at all or how the car runs it will be just louder I did a cat back in my camaro X pipe No muffler No tune nothing changed

[@bigkarl24]

Clous von muffler deletes on a vq engine sound nice 👍🏼

[@edge21str]

Hell, even older cars can compensate. My 92 miata is fuel injected and I've run it with a bigger diameter catback and even once removed the muffler leaving only the midpipe making it straight piped. In over 5 years I've never run into ANY problems with the engine and countless owners that put on a catback system and nothing else will tell you the same story.

[@jeremymenchaca]

Darn those pesky ECU's

[@hanzgerberpresents]

Scott Kilmer is my long lost father. Love you dad. Please send money.

[@Javier20104]

LMAO

[@GreatScottByJoe]

loool

[@PF-jn7xx]

Hey Scotty, great stuff....but not all cars will run poorly, or have the check engine light come on just by replacing the muffler. I replaced the stock mufflers on my mustang gt with magnaflow competition mufflers. The deep tone sounds amazing, and I've driven over 12,000 miles so far with NO check engine light, or rough idle etc. I guess it really depends on the car.

[@mikehughes8023]

P F What year is your car?

[@PF-jn7xx]

2016

[@nashvilleoutlaw]

P F I put a flowmaster and K&N filter on my 03 gmc 15 years ago and got an extra 2mpg on the interstate and never had it tuned or have any problems with it. Fuel injection can compensate for something so minor as a muffler or air filter change.

[@Litlogibear]

Nothing went off on your car because you just replaced the muffler not the whole system like Scotty is talking about. If you take off your catalytic converters (before the muffler pipe) that will set off the sensor

[@PF-jn7xx]

Logan Gagnier I thought maybe I missed something, so I just watched the video again. Scotty never mentions taking off the cats. He only mentions taking off the mufflers the entire video. Deleting the cats would not only mess with the engine programming, but forget about passing inspection.

[@wiannel9684]

Blah blah blah - Vvvrrraaphaphaphapha I can’t here you over the smile on my face dad 😂

[@vteckicksin4576]

*HONDA guys Triggered*

[@AnotherYoubue]

I didn’t it, just truth most wannabe Honda guys dont know jack

[@RuralMichiganDude]

That's no hornets nest, that's V-TEC

[@Patrick94GSR]

My Integra still has the original 24 year old muffler still fully intact.

[@pctshooter]

I had a 1982 Mercury Lynx that had a huge muffler and a tiny tailpipe that would top out at 89 MPH. I had the muffler taken off and replaced with an ANZA angle cut resonator tip. The sound was great. I put one of those TURBO stick on placards on the hatch lid. Everybody swore it had a turbo with it backfiring and flaming. It would then do 125 MPH with no further mods. I loved that car to death!

[@DartBProductions]

Better Title: Why Not to Change Your Car's Muffler with no Tune.

[@DuBstep115]

You can drive the car wothout exhaust and it still would be fine

[@16webb16]

AlwaysChristian wrong bigtime. Running with Fuel Trims skewed all over the place isn’t “the computer being smart enough to compensate”. If you want your car running right, play it safe, tune for modifications.

[@DuBstep115]

Webba i have been running de muffled car for 12 years without problem. If you need to play it safe the car just sucks.

[@AnotherYoubue]

Wow you need a tune just to change a muffler, you’re smart aren’t you?

[@DartBProductions]

Guys I'm not saying that I personally think you need a remapped ECU tune to change your muffler, I'm saying that Scotty wasn't focusing so much on the muffler change itself but on how the ECU handled the muffler change.

[@Cerebro960]

Hello Friend how are you? Everything you said is true because once you take things away from the exhaust system the car is much slower, feels heavier and consumes much more gas. I know from experience. Thanks for your good advice.

[@bodyshotjake7475]

This may have been true with older vehicles and may be true for some newer vehicles. However, there is plenty of dyno prof that the stock ECU tunes can still compensate and will absolutely make more power with a free flowing exhaust. Will it make more power with a tune? Of course.

[@AlainHubert]

According to this guy, engineers design perfect cars and we shouldn't do any mods to them. What he neglects to mention is that engineers are also restricted by governmental restrictive emissions laws and rules that don't allow engines to breathe freely. That's exactly what happened in the mid-seventies when engines suddenly lost hundreds of horsepower for the same size. It's like for a human to go biking with a scuba diving mask on.

[@rs72098]

I disagree. Even if that were the case, the engineers still designed the system around current stock exhausts. So modifying them doesn't improve much. You're better off putting an entire modified racing engine if you want engineers who are solely after horsepower. Most modern vehicles are designed around fuel economy. It's more like a human going diving in water with a scuba mask on.

[@leetskeet4476]

"I know more than engineers with decades of experience I'm gonna buy aftermarket garbage from China and show them a thing or two" fixed that for ya

[@racers115]

When you said you went to the Indy racing and was partially deaf for a days after I know what you mean. That's what it's like when I watch/listen to one of your videos.

[@vdopixel]

Whatever I wanted to do with my car he always says don’t do, i have a feeling one day he will definitely says don’t buy a car and “ JUST WALK “

[@geraldryan8562]

Hi Scotty, usually it’s international best practice to measure the DbA at 1 meter from the noice output, not at the tailpipe end! Just for info🤪

[@SlikLizrd]

YES !! One (1) Meter BACK from the pipe tips -- and CENTERED between the pipe exits. 85 Db is the upper limit, but nobody cares -- f**king babies hafta make NOISE !!

[@cctvspystore]

When i Pile Drive she puts out much more than 112 db....

[@zombieblaster5754]

Mad Hatter I approve

[@Dylan_Sterling]

Jesus Christ

[@DanielPfender]

I hope Scotty favorites this one

[@axjohn]

Mad Hatter you officially win the Internet! 👍🏽👍🏽👍🏽

[@DavidNowDnshady]

If you have a MAF efi system you shouldnt have to worry about "tuning" for a new exhaust system. The MAF calculates the additional air being pulled in and compensates that with fuel, thus telling the oxygen sensors what readings it should put out, please. Correct me if i am misunderstanding something here.

[@rossdavis428]

@David Now Well, you are right about Mass Air Flow Sensors being designed to help calculate the necessary air/fuel ratio. However, a vehicle's computer system (ECU) works in a more complex manner than a MAF. The ECU works with ranges of number values, which are set by the Manufacturer; the flow of the exhaust leaving the exhaust system is one of those values. Changing an exhaust system to a different exhaust system can upset these default Manufacturer number values, and thus cause a vehicle's engine to work improperly. - Ignition Timing could end up inefficient, the Air/Fuel Ratio to each cylinder could end up inadequate, Engine Temperature could end up higher or lower than normal. That is why a vehicle's ECU needs to be updated with the appropriate Tuning process whenever a major component of the vehicle is changed. Hope that explanation makes sense~

[@DavidNowDnshady]

Ross Davis i see this being more of a issue if the whole exhaust system is reworked vs just the muffler.

[@rossdavis428]

@David Now Yes, but remember that the muffler is still part of the exhaust system; it is a small piece of a bigger process~ Exhaust gases still need to pass through the muffler to complete the 4 stroke combustion process, so adjusting the muffler ultimately adjusts the vehicle's engine performance~

[@DavidNowDnshady]

Ross Davis more or less yes, but you wont notice a difference unless dino'd. Engineering explained even did a video on back pressure which in a sense correlates to the muffler of an exhaust system in which case doesnt really do much other than deaden sound, the catalytic converters provide enough backpressure for a vehicle that the muffler really i dont see causing any issues changing it or removing it completely.

[@rossdavis428]

@David Now I'm just stating that it does make a difference, regardless of how much or how little~ Whether you or anyone else thinks that is considered to be tolerable; well, that is not up to me~

[@majidabdurrahim5069]

i have a 2001 lexus rx300 they said i need a new muffler my engine light comes on should i get one or is it still drivable for now?

[@TheRugghead]

If Scotty couldn't talk me out of it, no one can

[@matthewtaylor386]

All you have to do is tune your car after you muffler delete.

[@KrasherAntz]

Only if you delete the cat

[@FirasLaallam]

I am alive

[@kiks7veliz]

Mufflers are past any o2 sensors..unless it’s a muffler delete(straight) then most likely airflow from the engines exhaust will change since exhaust air won’t have any restrictions and might change readings on the o2 sensor.. other than that a muffler with a different muffler won’t change much..

[@Foozefighter]

the rear muffler/s do not affect anything

[@danielrichardson2931]

Yes your right but it's extremely expensive , I have headers on my 350z and it runs better so a month later I decat itand it ran shitty ,I also had muffler delete ,now I put muffler back on with headers runs great

[@systemofadownsyndrome6177]

Meanwhile, I have a cheap aftermarket muffler on my grocery getter 03 malibu 🤣. Believe it or not it sounds godly and has a nice sound to it. Gives her a nice personality. . [ it's a sfi 3100 v6] .

[@Mel1n1]

I watched 14 seconds of this video and now I'm going out and straight piping every vehicle I own. Thanks Scotty for convincing me!

[@sveddish]

Is this just as true for Turbo engines? I've heard that to achieve more output from a turbo engine, you really want to evacuate the exhausts as quickly as possible

[@LeViIain]

Turbo's are powered by the flow of exhaust gases, so you couldn't be more right about that. You definitely need a tuner for that tho, too much airflow will lead to too much boost and then boom goes the engine.

[@MrRohanThomas]

I heard turbo car can benefit from it but on NA engines it can apparently lower your low end torque

[@landspeed2015]

Next time with Scottyy Kilmer: Why you SHOULDN'T rev your engines guys!

[@zacharyriley4122]

LANDSPEED he already did like 2-3 of those. “I know some of you are gonna say “but scotty, we see you revving your engines and doing burnouts all the time”...

[@billalmabuza8835]

Watch this video. I removed the Muffler anyway.

[@tiktoktiktoktiktok6065]

Billal mabuza well??? Did the performance of the car change like Scotty says?

[@romo134134]

@@tiktoktiktoktiktok6065 I changed the muffler on my '06 Tacoma and haven't had any noticable power changes or even a check engine light. Just a nicer sounding truck, which is what I wanted.

[@ICEY02]

Imma about to do it tomorrow haha

[@russianchopstick7938]

@@ICEY02 lol doing mine monday

[@zyonrichmond6945]

Me to

[@mariot.5178]

If you change only the mufler you don't need a tune. But if you change the hole exhaust system get a tune + intake I recommend.

[@AnthonySvt_]

How would a different muffler change AFR and mess with the O2 sensors?

[@ishtiaqueahmed7281]

El_De_La_Lobo I got catback exhaust been had it for a min no problems lol

[@douglasm1552]

It doesn't, the purpose of an O2 sensor is too measure. Yeah, If cats clogged it'll throw a code, but muffler has 0 affect.

[@Early_2K]

You don't need backpressure lmao watch engineering explained's video about it.

[@Mississippiking03]

Uhhh... you do need back pressure if you're driving your car every day. It will cause breathing issues with your car. It caused issues with my rt.

[@douglasm1552]

fuqoff aye? Nevermind. I read your thing wrong. You said backpressure changes with those things, you're right. Thought you were saying backpressure has affect on them

[@mean3g161]

Hey Scotty, this is why tunes exist

[@onealmr]

2JZ FTW If that's your Supra, I'm jealous

[@IdealContracting]

onealmr since he's just got videos of him playing video games, I'm gonna go with no lol

[@B_HarTz]

@1:30... says he didn’t use ear plugs at the race track and couldn’t hear for few days.... is that why he yells and shouts when he makes these videos? 🤔🤔 lol blown ear drums ? Lol

[@abandonedzombie]

LMFAO🤣

[@Gumorisco11]

Lmfao good one 😅

[@OnlyTheLetterG]

He’s American

[@c4lebsito]

if you put your old muffler back on after putting free flows would it fix it? or is there forever damage?

[@chasehammock]

I like the "VERY SENSITIVE" symbol of a crying little girl LOLLL Scotty!! :-D

[@brucewaynenotbatman]

This is targeted to the kids who ONLY do it for the sound. Those of us who mod and tune our engines is a requirement.

[@DavyDave1313]

i only do it for the sound. Car is A-OK

[@jameseroh6544]

Adding a Flowmaster Series 50 HD Big Block muffler. And a Bank's intake tube with the high flow filter. I think removed the negative battery cable for a minute. The results were quite than stock by 3db and 3mpg more at 70mph than 65mph. Diesels love more oxygen! And I recently passed the CA emissions testing. The tailpipe is also cleaner looking. The truck climbs the I-5 Grapevine hill 5°f cooler, quieter, and smoother. Not downshifting excessively. Staying below 2500 rpm at 65mph. Stays at 2k rpm at 70 mph. Got 3.92 gears and stock 31.6" diamond tires. Power, Stealth, and Economy! Also the factory had the dealer keep my truck on the internet link with Detroit for about 26 hours to study my truck. The transmission runs even sweeter than before. Runs mountain back roads beautifully. On a trip to Colorado, Wolf Creek Pass and the Eisenhower tunnel were easy! Just pick your parts carefully!

[@Father2462]

Agreeeddd I am modifying my Nissan Pathfinder lol

[@notmarcus421]

It's 2019 modern computers in modern cars can compensate for what little change if any taking a muffler would do to the car.

[@maxpower9175]

Watching this on Sunday, got my car booked in for a custom catback system on Friday, can't wait :D Edit: Love Scotty, but you have to choose what makes YOU happy :D

[@W.A.R.R.]

This is flat out wrong. Taking a muffler off is not going to affect your air/fuel ratio at all, or how your car runs in any other way.

[@npntransistor1505]

Pause the video at 2:09. As you can see most modern exhaust systems incorporate a resonator and catalytic converter. In older systems the muffler was solely responsible for fine tuning back pressure and sound. In newer cars the cat and resonator create most of the back pressure and really eliminate most of the exhaust noise. The muffler is there just to fine tune the noise. He missed an opportunity to explain the functions of components in an exhaust system.

[@rdeh1678]

you may lose some back pressure but not much

[@benson2873]

0:41 what’s he lookin at?

[@bluedinero3055]

Teleprompter

[@goosebee]

Yo benson, how's modacai and Rigby? Still bothering ya?

[@brisonculpepper8079]

Goose Bee dude😂

[@Philip-kc2et]

Oh boy, is he blind?

[@JorgeEspinoza-ov7nj]

Coming soon why not to drive your car

[@ilynpayne7491]

Even the MUFFLER man this guy is against everything

[@JackDanielsCHS08]

ilyn Payne not motorcycles 😎

[@quantae7]

Ikr he wants stock everything lol

[@rodnocker505]

Come on Scotty you was a teenager once like me (old guy) lol. These young guys get their cars tuned when they mod them. Stop trying to discourage kids for doing what we did in our day. Yeah things have changed and there’s different ways of tuning and tweaking and things these kids do than we did. Yeah computers are involved these days but these guys are super savvy at that too. I’ve learned a lot from young dudes on the KZbin about tuner cars so I got me a Hyundai Veloster turbo lol and I love it and love learning what this new generation of guys do to mod their rides. Let’s see some encouragement to the new generation of gear heads…how’bout it