"Project Midnight" Silverado 2500HD 6.0 Flowmaster Super 40 Muffler Install

[@jasonhull5712]

Love that body style. Mine is a 2004 2500 HD. That 6.0L engine is a beast. 300,000 mi and still lays patches for as long as your foots heavy.. lol life with a lift in your shop... ahhh yes... one of these days I'll have one too..

[@mattleonard5268]

That’s a very refined and deep sounding exhaust for a 6.0

[@OddTimeMan]

Nice. With my GMC 3500HD dually (7.4 Vortec), I opted for the Holley Flowmonster. It has two 3" inlets and two 3" outlets. It's a straight-through stainless steel Magnaflow-style muffler with two perforated pipes and packing. Sounds pretty darn good.

[@fatherguidosarduchi5204]

Finally someone that knows how to weld correctly. Your welds don’t look like worms gone wild. Just think the power company loves to see people welding. They re counting the number of turns your meter turns , ha, ha.

[@nathanharland3375]

I went with a magnaflow straight through 3 inch, there is only drone at 50mph-ish, but still loud enough to turn heads

[@zynnertime1]

I finally put a dual exit super 40 in my truck and it’s honestly way quieter than what I expected

[@Flowe_Grading]

Super 10s brother

[@graysonsgarage5157]

Sounds good man, I've got the Super 44 exhaust system on my 06 1500, these Flowmaster exhaust systems have a very nice sound.

[@KsKaylor]

Like everyone else has said, if you had tailpipes then you probably wouldn't have drone issues. It would sound a lot better that way too.

[@roberthillsjr.3729]

I do'nt care for Chevolet products but that sounds damn good.

[@jacobltrotter]

My 04 2500 doesn't have cats. And I have dual 3 inch dynomax race bullets. In to the factory Y into a 4inch tip in the factory location. It's stupid loud. A little annoying at times, but really no drone

[@livewithnick]

I’ve got the super 10 Flowmaster on my 2002 6.0 2500 work truck. Sounds about perfect to me.

[@slaytanic921]

How’s it sound while towing?

[@coreymaynard6153]

I just put the 40 series on my 02 1500 that I swapped to the 6.0 and 4l80e, sloppy stake 2 cam. Straight pipe was ridiculous. It's stock manifolds, stock piping which is not true duals. Y's up before the transmission. But it sounds great. I love it. Especially after running straight pipe for 2 weeks.... little drone at low rpm. But none at all while accelerating.

[@mossman381]

There is a certain rpm that makes a horrible drone. I still have this muffler and still hate the drone. In my younger years I probably would have loved all the noise.

[@jko0526]

Sounds great! I did the same thing on my truck only went with the flowmaster 50 series.

[@mossman381]

How is the drone in the cab?

[@jko0526]

Not bad at all! I get a little between 1 & 2000 rpm but I did read some where that there is a big difference between the 40 & 50 series. I do have mine dumping behind the rear wheel.

[@davidd6854]

I have a similar set up on my 2001 1500HD but it’s ran out the back with 4 inch echo tips. Sounds good

[@mossman381]

Do you have a bad drone in the cab?

[@devinbolsen4800]

have 2 of these on my 98 k2500 with A 5.7 vortec that has a cold air intake. those two upgrades alone make a difference compared to the stock 5.7s ive driven

[@mossman381]

With the headers and the muffler the truck feels like it has more power. This truck also has 4.10 gears so the big tires don't effect it as much.

[@mac007taz]

mossman381 did you tune it after you did the headers?

[@x-man5056]

Factory probably saved $3.50 (tree fitty) per truck by going back to single pipe from the muffler back. A very experienced race engine builder told me that for gas engines...unless you are regularly seeing RPMs above 5000K, you just don't need more than 2.5 in pipe, not even on a turbo engine. A truck particularly needs low end torque, not high rev capability. Does not apply to Diesels. What you did here was just right.

[@maverick8014]

What is the size of the wheels and tires you have on there?

[@taylorgrim1255]

this is the same set up i ran on my 2000 2500 sierra for years sounds great but the cab noise is a little much. thinking about changing to a dual in dual out dynomax ultraflow and run it to a single pipe out the back.

[@dennisleinart7683]

On the factory muffler the drivers side exit pipe is a dumby pipe, it goes back into the muffler tuning chamber. It basically does nothing. So it only has 1 exit pipe functioning.

[@wufirefighter1]

I'm running the 40 series on my 2012 gmc z71 I love the way it sounds

[@mossman381]

I am getting a lot of drone in overdrive. Love the way is sounds.

[@isaac-jk8pz]

add longer tips or throw in more piping it will take the drone away I put same muffler on my Tahoe and it was super annoying when doing 100kph, I added like a foot more of piping and it went away

[@Anth4044]

Sounds really good 👍👍

[@ReidHenderson]

Probably to late to tell you but always add atleast 2 to 3 foot of pipe behind a Flowmaster to give it some tone. If you don't it just sounds like a dump truck

[@rgwheeler3450]

Nice sound on that flow master!

[@stangman1268]

here is my two cents if people complaint about drone while cruising then don't change the factory set up,personally i go with flowmaster over any other exhaust system i'm a fan boy i guess?on my page i have exhaust clips of a dakota i use to own with two separate systems in the end it ended up with the chambered muffler similar to flowmaster but not as pricey,i also had a 77 Ford flat bed with a 400 engine cammed and i ran a full flowmaster exhaust although i didn't record any clips..

[@mossman381]

Yup, that is why my new truck has the factory muffler.

[@nuttwg6521]

If you cut it from the bottom you won't have to worry about it binding

[@jacobzueter6578]

I got a glas pack on mine and it drons bad i been lookin in to other mufflers and systems and this helps my research better

[@rockymtnredneck4888]

A set of magnaflow turbos with some summit racing resonators got me a 10Db drop on my dual 3" system. Very noticeable, but still more drone than I like living in the hills like I do.

[@harleyguyinmilw]

a set of full tailpipes would help allot with your interior sound issues, ending the exhaust under the bed leaves too much sound resonance

[@mossman381]

These trucks are known for bad drone. I had some glasspack style mufflers on a 6.0 with full tailpipe and it would rattle the rear window when I got on it. I think the muffler case is to small.

[@BigRandyR]

Truck is looking great, Sir.

[@mossman381]

Thanks, it's rusted pretty good but have plans to fix that.

[@slowride55]

Friend of mine has the same truck will all stock exhaust other than two 3" pipes instead of the muffler. Very throaty and only snaps at a certain rpm.

[@mossman381]

This has too much drone for me.

[@slowride55]

Thrush welded man.

[@rickyredfern5200]

Sounds great! I wish mine sound that nice.

[@YoungerPrice]

of course you have drone its dumped under the truck throw so tail pipes on it sound way better

[@mossman381]

That may help some but the whole muffler is vibrating. These trucks are known for that. Also this generation has cab vents on the back of the cab right in front of the bed.

[@slscout]

a lifted truck without negative offset wheels 😱

[@mossman381]

I like my tires mostly inside my wheel wells.

[@jeffanderson7256]

mossman381 i like the way it looks but wouldent a lifted truck be less tippy if it had a lil more offset?

[@mossman381]

You will get more stability the wider you go. This truck doesn't feel tippy at all. It feels pretty stable. It still has a front sway bar.

[@tl5108]

The way i like it

[@darrellroireau4061]

Sounds good but bet if you change the weed burners for longer tubes it would sound even better! I wouldn't mind the drone bet it sounds like a monster! So they don't have 3" inlets available? I gotta get one for my 6.0!!! Cheers!

[@mossman381]

The drone is pretty bad in overdrive so I probably won't be keeping this muffler. It sounds awesome just the drone is bad. Might try a few different things to see if I can stop it. They do sell dual 3" in but then it only has the single 3.5" out. This muffler should out flow any single 3.5" out muffler.

[@darrellroireau4061]

mossman381 Thx for reply. I will have to look into that since I want to stay single pipe out the back.

[@dewaynemiguel3349]

They will cook that shock

[@tokiwartooth2661]

He said the tips were temporary just to see if he liked it

[@rangerismine]

Sounds good. Your rear shocks are upside down though.

[@zxJC34xz]

Johnny Doey does that aftect it in any way

[@joshua.johnson]

If it had high flow cats or no cats, would it be much louder?

[@Todd_S]

It sounds great!

[@J8ck_hoff]

super 10s sound way better.

[@mossman381]

Might as well just run a straight pipe if you run super 10s. Those are just for race cars that are required to have a muffler by rules. I ran straight pipes one time on a 6.0 and it would vibrate my back window so bad it gave me a headache. This muffler has more drone than I like and will most likely be replaced.

[@mac007taz]

mossman381 check out magnaflow, I used to run flowmasters but the drone was noticeable. magnaflows sound great and I personally don't have the same drone.

[@AlaskanCharlie]

@@mossman381 You should have ran it out the back, I have a 3" in and 3" out Flowmaster Original 40 series on my 06 2500HD 6.0L. I ran it to the factory Y and out the factory tailpipe and while it is fairly loud it doesn't really drone in the cab. Granted mine is a long bed and not a short bed but that shouldn't make that much of a difference. This is actually the first Truck I have had with a Flowmaster that doesn't actually have drone lol.

[@masonrink8568]

Cut my muffler off ran to stock tail pipe same place as stock happy with sound!

[@jonnysg1708]

Nice Sound bro👍👍❗

[@rockymtnredneck4888]

You missed a golden opportunity to rev it straight pipe before the install! Sounds good, though. At what RPM is the interior resonance? I have horrible resonance at 3000RPM with dual 3" and even with 2 mufflers and 2 resonators. I'll be doing some sound deadening and insulation when I re do the rear carpet. Maybe that'll kill the issue for me? We'll see....soon as the remodel of my house is done.

[@mossman381]

My drone is horrible at 1600-1800. That is right were it sits at 55mph in overdrive. Probably not going to keep the muffler because of that. When you rev it up and hard acceleration it sounds awesome with little to no drone.

[@rockymtnredneck4888]

Yeah, that's a low RPM to have drone at. My current set up is only bad when I'm loading the engine hard like merging onto the interstate or climbing hills, still enough to bug the piss outa me. I did a before and after with a simple iPhone Db meter app and I lost 10Db between my old and new setup. Like I said, I'm done toying with the exhaust. There really is zero insulation or deadening under the rear carpet of my Suburban where the mufflers sit. That's what I'll hit next.

[@adubbz23]

mossman381 love the blue bow tie. What paint color is that?took it back old school

[@jorgegonzales878]

nice HD truck

[@MisterJ.J.]

Flowmaster's Delta Flow series has less interior drone.

[@doc559]

Great Weedburners. Great result. Thanks for posting 👍

[@eddiehregdovic8728]

nice video sounds great. I was gonna buy a muffler for my truck but I don't know which muffler I should buy

[@mossman381]

It sounds awesome but the drone in overdrive is getting pretty annoying.

[@jko0526]

Extend those tailpipes to behind the rear wheel before you ditch the muffler. I think that will help with the cab drone.

[@OffRoadRunner94]

My brother has a 2003 crew cab short bed 2500 with the 6 liter and he ran a thrush muffler to a 4 inch tail pipe and it sounds amazing. It has a mild volume and a great time with very low drone in the cab. Just an idea if you decide to change it up.

[@mossman381]

I was thinking about trying a Thrush next.

[@OffRoadRunner94]

I will try to get a video of it and post a link in the comments when I get it.

[@OffRoadRunner94]

I was Wrong, he ended up running a flowmaster. but here is a link to the video kzbin.info/www/bejne/hYWvpKt5gbesra8

[@bondovwvw]

@@mossman381 you need to put a MagnaFlow or spintech on it if you do not want drone

[@johnvallejo3211]

Hello, I just watched your posted video of Flowmaster muffler install and after watching it made me think about exhaust fumes coming into the cab. So, in looking at the muffler i noticed you did a turndown stile (no tailpipe) and i know you mentioned you may change it later but if I were to do that type of style (turndowns/grass burners) will fumes likely be coming into the cab of the truck or is it ok? so im wondering when i do my muffler replacement if i want to do turndowns or add tail pipe. So does it, are fumes likely to come into cab with turndowns at end of muffle undernieth cab? I know that some folks do that style and ive always wondered uf fumes bother them at all. I have same truck. Thank you

[@mossman381]

It's best to run tailpipes out the back or sides to get the exhaust gases away from the truck. I only did this to see how I liked the sound. With the wind blowing different ways exhaust gases could get into your cab. I haven't really noticed any fumes in my truck but I can't really recommend turn downs under your truck.

[@walkingfreak]

Not loud enough for my taste but it does give it a bit more of a guttural bark. you forgot to fire it up without any mufflers at all too haha.

[@mossman381]

The drone in overdrive is pretty bad. Not sure I can live with it. I did do a before video but it was quiet. All you could hear was the motor reving up. Didn't think it was worth adding to the video. Everybody knows what a quiet truck sounds like.

[@LirokuToragi]

I swapped headers onto mine, decided to fire it up with just headers on, it wasn't nearly as loud as I expected. We had my dad's 4.3 GM V6's exhaust down to just the stock manifolds while we changed transmission out and it was louder than my 6.0 I think haha.

[@slaytanic921]

@@mossman381 we’re you towing? I am looking for a muffler that won’t drone terrible under load the few times year I pull my rv.

[@TheFiendRacer]

Sounds kinda wierd... doesn’t sound like a Flowmaster

[@jewllake]

any seat off the pants noticeable power increase?

[@mossman381]

With the headers and the muffler I think it has more power.

[@rockymtnredneck4888]

Free-flowing exhaust makes a difference on most any truck I've ever owned.

[@jacobhillanbrand7988]

So you like the flowmaster muffler on a daily driven truck? Do you think.its to loud or its ok? I wanna get the 40 series on my 2016 Silverado 6.0 liter. I have the 50 series now. Just wanna go a little bit louder

[@mossman381]

I like the sound out of the pipes but hated the drone at certain rpm. Has me gun shy to put a muffler on my new truck.

[@AndyOamo]

Why not get a muffler with the right size inlets instead of using reducers that restrict flow and hinder preformance?

[@mossman381]

This is what they had at the store and you aren't taking any performance away because dual 2.5" will outflow one 3.5".

[@AndyOamo]

@@mossman381 I'm not say one 3" is better than two 2.5" pipes, what I'm saying is a muffler with dual 3" in and out would flow be better than restricting them down to 2.5". If your doing it to sound good it's fine, but when trying to make power, reducing exhaust size is a no no.

[@mossman381]

You could put a 5" exhaust on this truck and you won't see anymore power gains. Loosing the back pressure might even hurt the power in the lower rpms.

[@viivcreations9161]

You tried delta flows? They got great street manners but still offer enough ear candy

[@mossman381]

I haven't but should.

[@jamesdionysius9945]

Are delta a better muffler?

[@mossman381]

@@jamesdionysius9945 Not sure they are better but I think they have less droning. Maybe quieter too.

[@dakotahschatz9876]

Great video but, your information on pipe size and flow is incorrect. I dont have cfm numbers but I do have gallon per minute. 3.5" pipe will flow 160gpm where as 2.5 will flow 65gpm X2 for duals. Which makes 130gpm. All data aside its not gonna make a performance difference on a stock 6.0!

[@mossman381]

I am not sure water and air are comparable. You would have to show me real data for me to believe 3.5" outflows dual 2.5 by that much.

[@dakotahschatz9876]

Isn't flow flow?

[@mossman381]

I don't know. What is a gallon of air? Air and water are very different so why would they flow the same? I am not saying you are wrong or right. They just don't seem comparable. Just looking at the size of two 2.5" pipe next to a 3.5" seems like they would flow similar.

[@elicrumley7128]

Does the truck sound a lot better then stock ???? I have a gmc 2500 hd 6.0 2005 Trying to decide if I should do this ??

[@mossman381]

The truck sounds great but the drone in the cab is pretty bad. It's ok until the truck goes into overdrive and certain rpm.

[@nuttwg6521]

To much back pressure if you put it in backwards

[@MrBixl]

When are you doing rocker panels?

[@mossman381]

That might be awhile. The paid channel gets the new videos first. This channel is 1-2 months behind on the projects. I might be purchasing the rockers next week. Not sure when I will get to installing them.

[@JLannon15]

Did you do anything with the intake or just the exhaust? I'm thinking about going cold air in and Flowmaster out.

[@mossman381]

Just muffler and headers. Check my playlist on this project for the videos.

[@stealthcon6975]

What shock u running

[@Flowe_Grading]

Just cut my Escalades 3.5 inch stock exhaust off with the cheapest angle grinder Walmart had to offer

[@bigchungus7720]

I don't have a welding machine could I use sum clamps?

[@mossman381]

You can use clamps to install mufflers but welding is better.

[@bigchungus7720]

mossman381 ok thanks, I wanted to get a super 10 single in and single out 👍

[@mossman381]

Might as well just straight pipe it. That super 10 will do little to muffle the sound.

[@bigchungus7720]

mossman381 do I need back pressure or no 😕

[@fishinwithryley4547]

Does this add better fuel mileage

[@mossman381]

It probably helps a tiny bit, but I have found when you put a muffler on something you end up pushing that gas more than before. That equals less mpg.

[@iSnipedET]

I have the same model truck, I noticed that there is a whining noise when accelerated mine does the same, is this a sign of a bad bearing somewhere or what?

[@mossman381]

Pretty tough for me to diagnose a sound over a comment. You sure the whine isn't your power steering pump?

[@iSnipedET]

I realize its a dumb question to ask over a comment, just realized that your project midnight made a similar sound to mine

[@iSnipedET]

You can hear it a 13:30 ish

[@mossman381]

That is the power steering pump.

[@iSnipedET]

Thanks for the info man love the channel

[@jamesbell8623]

What size tires do you have in the truck?

[@mossman381]

35x12.5x18

[@ethanb1109]

Sounds nice and mean

[@nolanmartin9156]

It will sound like a bag of bumble beez if you put that muffler in backwards

[@mossman381]

Things that might help with a project like this: Flowmaster 40 Series: amzn.to/2QkX7vO Flowmaster 50 Series: amzn.to/2Eez10k Dewalt Saw: amzn.to/2FFrCZq This video contains affiliate links, which means that if you click on one of the product links and buy, I'll receive a small commission.

[@KsKaylor]

Needs tailpipes for best sound and less drone.

[@mossman381]

It sounds great. The reason these trucks drone so bad is the cab vents are on the back of the cab. The worst place for a performance muffler install. You can run straight pipes with no drone because there is no muffler under the truck to make the terrible noise.

[@KsKaylor]

mossman381 I've had straight pipes, Flowmaster and Magnaflows and they all drone to a certain degree just because they add extra volume. Dumping the pipes under the cab will increase drone compared to running the gases out behind the truck. It sounds fine but tailpipes help resonate the sound with flowmaster for a fuller and richer tone and it looks better imo.

[@mossman381]

I have had straight pipes and I didn't have any drone. I would have gone that route again but they are loud. I have had many exhaust systems on these trucks. I had glasspack type mufflers on a 2002 extended cab once and it would rattle the back window. The cab vents are the problem not the mufflers. I have considered moving the cab vents.

[@KsKaylor]

mossman381 have you ever had 8” glasspacks or muffler delete with just an X pipe?

[@mossman381]

I had some off brand glasspacks before and will never do that again with this body style. The 88-98 and 73-87 trucks handle mufflers better because the cab vents are in the doors. I have not had an x pipe yet but will probably be changing this muffler setup to straight pipes with an x pipe.

[@truthseeker7084]

I'd love to know where you found that grille, or is it just the stock one that's painted matte black

[@mossman381]

Grille was broken so I glued it back together and painted it with bedliner spray.

[@truthseeker7084]

@@mossman381 good deal just was curious and idk why now your video just popped up in my feed after all this time but good video.

[@mossman381]

Thanks, I have a lot of good videos. I have a whole playlist on this truck and many more.

[@truthseeker7084]

@@mossman381 why yea I'll check it out plus I got almost the exact truck myself 02 silverado-2500-hd crew cab with 12 inches roughly of lift on 40s currently. Bunch of other add ons but looking to change it up a bit. Insta is bennybigrig007 and coolhand2b is tiktok. Thanks for the reply I'll definitely see what ya got 👍

[@togodbetheglory9725]

Diesel should have come with 4" the engine breathe better

[@johnkramer7161]

It's not a diesel.

[@paulawoodhall2272]

ummm you get sill rust fix it bad

[@heycouper629]

Ask the shock what it thinks lol

[@julioyescas27]

Sounds mean

[@darrellblackwell6586]

Imop, sounds like crap.

[@brybry6805]

Quiet

[@mossman381]

It sounds quiet in the video but it has a good sound to it. It's not straight piped loud. I am still running this setup and still hate the drone in the cab.

[@reaperct3454]

Cut off the cat and it will sound alot better

[@jacaughron55]

Aaaaaaaaand that's why people put glass packs on trucks instead of this pansy crap

[@mossman381]

A super 40 is pansy crap???? I have had a glasspack type muffler on these 6.0 engines and it will vibrate the rear window and make your ears bleed after a few miles. This muffler sounds great but has a bad drone at certain rpm. In my younger years I wouldn't mind but now I don't want to hear the drone anymore.

[@alphacapo]

Sounds like a giant farting into a coffee can. Flowmaster just doesn't do it for me on stock motors. I like the way they sound at idle. Then anything over 50 percent throttle just sounds trashed.. Am I crazy? Or do others feel the same. Flowmaster is always so hit and miss.

[@viivcreations9161]

lift is a bit too high

[@JamesJohnson-kn8hc]

The smaller the exhaust the more resturfull it will be not more power

[@SuperAncientAlien]

Truck is too high....looks tippy, like a ballerina

[@mossman381]

Truck is pretty high with the 6" lift and 35" tires.

[@alphacapo]

Sounds like a giant farting into a coffee can. Flowmaster just doesn't do it for me on stock motors. I like the way they sound at idle. Then anything over 50 percent throttle just sounds trashed.. Am I crazy? Or do others feel the same. Flowmaster is always so hit and miss.

[@alphacapo]

That being said I think borla and Chevy go together well... The simpler setup usually sounds the best too.

[@mossman381]

I like my Flowmaster. Hate the drone on this one.