Porsche 997 Exhaust Mods Mythbusted

[@joequad15]

You gotta respect Andrew “we simply don’t have the time or the budget to test and develop any type of variation to the header” no excuse, no bullshit, just genuine content👌🏽

[@ssj1jason]

I agree and also respect the honesty BUT doesnt that statement invalidate the entire video? Especially added with their acknowledgment that the header is the place to gain power... furthermore this goes back to their intake video as well *if you dont reflash the PCM or replace it with a programmable PCM none of these upgrades will deliver top power

[@ΘάνατοςΧορτοφάγος]

Upgrading your exhaust with a turbo works really nice 😉

[@alternativeperception6949]

😂😂😂👍👍👍

[@dan555smith]

with the fab costs and extra intercooler, might as well buy a turbo model. With this model, I'd probably but 3" exhaust on this one bigger intake pipes and make sure intake is outside of the engine bay or at least fresh air.

[@tscrookeful]

Now combine the two videos! intake mods, ipd, gt3 throttle body, intake, and exhaust mods, no cats, straight pipes to see what kind of power it makes!!! Great content you have a new subscriber!!

[@Khanh.Nguyen369]

I love how thorough you guys are with showing results. Anyone can claim gains but proving it is different.

[@MotiveVideo]

Cheers. We got sick of claims and "it feels quicker" with no proof so we wanted to do it properly

[@craigbullock8245]

Loving the content Adrew. Thank you.

[@TheRealMax77]

Will the intake mods give power know that the engine can breathe better? I would test it just for the hell of it.

[@neilkasher]

I absolutely love these Porsche vids! Great work guys

[@TheBondy666]

Hey guys you know this hasn't been made an uploaded vid? Like in the "uploads", I only found it buried in a playlist after watching the intake vid

[@MotiveVideo]

We know

[@ALs_Autos]

U deserve more subs with the effort u put into these videos mate, cheers

[@bososoku]

Timing on this vid couldnt be better, after 12 years with a BNR32, i’ve finallly gone to the dark side and picked a 997 C2 as the new toy 👍

[@SaveOurAmerica]

Congrats! You'll love the Porsche experience. My 997 is my ultimate favorite car out of my lineup

[@scottsanders2641]

Love my ‘08 C4S! Enjoy your Carrera👍

[@martinluton6513]

I would be great to see crosover 200 cell cats vs an X-pipe. I'm certain the crossover pipes are less restrictive and it would be satisfying to see it proven. Also, if you're able to try a generic aftermarket sports muffler, vs stock, vs the best system you can fabricate then that would settle a lot of internet arguments. You're doing great work with these videos, please keep it up!

[@MotiveVideo]

If someone gives them to us we will. We simply can’t afford to buy them and test them ourselves. Porsche muffler or x pipes are thousands of dollars each , so to compare would be over $6000 and then there is our time filming and editing. The video would need a over a million views to break even, which we’re not big enough to get.

[@rust3dsteel]

This is great content! Very interested in the further experiments. Saving all us 997 guys money!

[@jonathanrwegner]

Excellent, I’ve been looking for this info somewhere and from Oz no less (ex-pat living in the US now) - have been considering whether to do something to free up airflow on my 997.2 C2S, super informative, thanks! 🙌🏻

[@sac82287]

This is very helpful … please do more of these with different cars.

[@leonthalion]

Now that the intake dynamics have changed, it would be interesting to see if the air intake test results would change accordingly.

[@MotiveVideo]

We would be 99.9% chance the intake mods we tried before will do same thing. Nothing, or lose power.

[@leonthalion]

Motive Video What about making your own intake from scratch (for the same reason you made your own exhaust). Either way thanks for the reply and the great content.

[@leehartshorn1479]

Great video guys ;-) would like to of seen what something street legal such as 200 cell cats would have achieved but like you've said point proven there are gains to be had even if it is minor

[@MotiveVideo]

It gained 3hp removing cats altogether. But it makes it sound terrible We’re trying to secure a 100 cell cat x-pipe to test

[@jamesmay1322]

I wouldn't call a loss of power under circa 2,200 rpm an increase "across the entire rev range". It's amazing how many dyno runs for exhausts conveniently don't show the results of the run below around 2-3,000 rpm. Almost certainly because the vast majority of aftermarket exhausts are a compromise, they gain midrange/top end power at the expense of the low end. Simple fact is, that the stock exhaust of most sports (or even sporty) cars these days is very hard to improve upon without incurring losses somewhere. Now sure if you're going to drive your car exclusively on the track you're only ever going to be below around 2,500rpm at the start of the race so it's irrelevant if there's a power loss there, but for a road car (especially one driven in town a most of the time) a loss of power below 2-3,000 rpm just results in a much poorer driving experience overall as you've lost that important low end torque/tractability that's so necessary when pulling away from lights etc.

[@Rob-vp9xq]

Great straight up info. Nice to see just the facts.

[@tlzangl]

I didn’t believe how loud a in my case 3.4 flat 6 could sound without mufflers. Installed the test pipes late in the afternoon, drove around the block and reinstalled the mufflers. Made me feel like an old man thinking this thing is too loud.

[@martinrodger9565]

Standard AFRs at upper rpm appear very rich. A lot of modern German stuff runs really lean and mean. Cleaner AFR post exhaust mods once you knock out some restrictions, really nice logging on the mainline.

[@MotiveVideo]

They were richer stock, the aftermarket exhaust leaned it out a bit high helped make more power

[@marcwagoner568]

Love to see the intake mods added to the muffler delete.

[@MotiveVideo]

The intake would still lose power with any exhaust on it at same time. You can see why it loses power. Nothing would change that

[@diogomacedo-l6o]

High! Great Vídeo! You do go to a huge extend to show real facts. One question: the muffler delete, does it generate droneing/resonances while driving? Is it excessively loud? Thank you so much

[@trentcrompton9527]

Motive bringing the mang back 😂👍

[@MotiveVideo]

Mang sounds terrible in any brand of NA 6-cylinder 😂😂

[@joshdobson2737]

Always fun learning something new!

[@ajberg6451]

This is great! Thank you! What you're testing next ?

[@neilschneider7367]

Another great video. I wish you had my 991 TTS to experiment on. Thanks for a great video

[@MotiveVideo]

We wish we had a 991 TT! We'd get carried away no doubt.

[@GreenChoiceMA]

muffler delete on 3.8 is amazing

[@zachaliles]

The way you say mainline Dyno made it sound like you said Mainland China with a very thick accent.

[@tz6414]

Saving Porsche owners millions of pounds on daft aftermarket performance. I have done intake mods, header and exhaust on mine and I agree zero detectable on the road power difference, just more noise. Ended putting most of them back to standard.

[@brianhimmelman420]

was it a Carrera ?

[@denisbassom172]

Very intelligent video, thanks

[@rotort]

Check out the exhaust we recently made for hard tuned. Net 997 has a x-pipe high flow cats and two mufflers

[@BRAINWASHDrider1]

The intro slaps so hard. Lol

[@Nismo-gy3wz]

AES has done Porsche mufflers, great results...

[@pjay3028]

That looks like the identical exhaust system that is used on the 3.8S car, apart from the tips. I wonder if there would be any greater gains on the 3.8 engine?

[@HHCHunterYTC]

Supercar KZbinr's dislike this video

[@jimc793]

Great test and I appreciate your honesty and budgetary constraints. I noticed (at 4:28-4:41) that you've got a different nosepiece on your 997 than what we have in the States. Reminiscent of a GT3. Is that standard in your country or aftermarket and does it mean you also have a third central radiator on your 3.6 997? Here in the States, that central area is closed off solid and the two radiators are on either side of that central area. Great video.

[@giuliomalloni3975]

Why is there such a drop in power ? from 325 to 269 ? :( Is a loss of more than 50 hp normal ?

[@mikefranky]

I put stainless manifolds(Headers) on my 997 wouldn’t say more power but definitely revs better As for the system it’s still stock There’s not a lot available in the uk🤷‍♂️

[@MotiveVideo]

Did you before and after dyno test it? Sometimes exhaust are just a placebo effect

[@mikefranky]

Motive Video ....No never had it dyno......after spending £6500 on engine rebuild (Bore scorning) etc I’m to frighten to rev the bloody thing 😂

[@ichibawa1]

Hi Andrew, Noted in previous video, intake mods did not yield much if at all. Could it be due to the restrictive exhaust? Could you run the IPD intake mod with the exhaust mod to test it out? Wondering if the freer exhaust would help the intake plenum mod....

[@andrewrigg4905]

I agree, Also exhaust back pressure testing before and after would be interesting data to see also

[@taimaishu-nao1922]

Andrew mate, you need a front lip spoiler for that 997.

[@MotiveVideo]

We’ve thought about it but it would hang lower than rest it car and make it almost impossible to g at in our driveway or let anyone else drive it

[@douglasnorman8748]

Great video! A couple confusing things. you say the timing was less on the highest hp yet the graph at 6:05 shows the highest power at 24 degrees? I guess and the lowest at 20. Also at 5:32, what is that big reduction in power at the low end?

[@rfaelcarazo9945]

You need a tune when you change airflow in the engine.

[@slytherben]

Brilliant! Plus, by removing the two mufflers you reduce eight by 80lbs or something

[@TheRacerRich]

Now try putting the IPD plenum and throttle body back in, and see if freeing up the exit side will let it benefit from freeing up the intake side.

[@MotiveVideo]

Ita did nothing, just like the first time

[@TheRacerRich]

@@MotiveVideo Thank you for doing the Lord's work.

[@ALESUPERBIKE]

283 cv with muffler bypass + cat bypass ?

[@craigpeart7291]

Run a 964 3.3 Turbo standard system just cat delete and wastegate cat delete also running a G Pipe definite power gains..

[@drtdev4968]

what specs are the wheel and tire set up?

[@ziadkabbani4479]

Great vid Andrew! Just a question though, from what I understand the exhaust system is always limited by the section with the smallest diameter. So maybe going up from 2inches to 2 and a quarter also played a part in the power increase?

[@MotiveVideo]

For us it didn’t really matter what caused the restriction. Just proving that there is one and power can be increased.

[@ziadkabbani4479]

@@MotiveVideo I see, makes sense. Keep up the great content!

[@jpsr20det]

Now you can re install the intake mods and see some more gains ....

[@MotiveVideo]

They will do what they did last time. Nothing or lose power again.

[@jpsr20det]

@@MotiveVideo I do not think so , you complete change the way the motor behave with freeing the exhaust , but good luck

[@pjay3028]

@@jpsr20det the 4% increase they got from the exhaust mod is hardly "completely changing the way the motor behaves"!

[@MotiveVideo]

Plenum and TB did zero changes to anything in the data logs last time. Intake lost power due to being rich and hot air. That won’t change

[@jpsr20det]

@@pjay3028 regarding in how the intake its going to react , it will.

[@neilmartinez143]

Great tests. When are you doing this with a Porsche turbo?

[@MotiveVideo]

When we can afford to buy one. We're a few million subscribers short!

[@ackilbits]

Do you think that the intake mods would add horsepower now that the exhaust is breathing better? 🤔

[@ackilbits]

Or were they just more restrictive than factory from the beginning? One sure fire way to find out lol

[@dalestraw2094]

Are you now going to revisit the intake options as the Exhaust was clearly restricting air flow?? Just curious. 🤔

[@MotiveVideo]

We wouldn’t call 12hp restricting flow. There was no change to any variables either the IPD inlet and intake kit lost power. They’ll do the same now

[@dalestraw2094]

Yeh cool. When you put it like that 🤦‍♂️ lol. Thanks for the reply.

[@MotiveVideo]

If we thought they’d work now we would do it but to be honest, we think it will be same result from inlet parts. Hopefully someone will let us try something that does work.

[@dalestraw2094]

That would be cool. I love the direction your going with this too. N/A engine trailing different ideas. Amazing content and I am really enjoying it. Hopefully I can keep watching and providing support for you to continue doing what your guys are doing.

[@fckdb4brth]

my thoughts exactly, just for science. Dont expect any change or maybe a 1 or 2 hp gain

[@curtis9918]

Great video

[@memomomomomo185]

Did it change the torque figure much?

[@pjay3028]

Did the second run with the cat delete also use the straight pipes? If so, did the straight pipes give 10bhp gain and then the cat delete only give about 3bhp on top of that?

[@MotiveVideo]

Yes

[@charlybilloir9048]

How is it possible that the cat delete give only 3bhp?! I thought that was the most restrictive area of the exhaust system, isn’it?

[@ALESUPERBIKE]

@@MotiveVideo the best modification is to eliminate the final silencers and the filter inside the original airbox?

[@ahmadmariri]

Cool video like always..

[@Alfaholic168]

Is there a way to tune these things in Oz without buying mail order tunes?

[@MotiveVideo]

We’re trying to find someone who can.

[@idokwatcher2062]

With good internet connection and desktop/screen sharing many people rent a dyno and have someone remote tune it.

[@mitchsmith8980]

What's the weight of the vehicle?

[@mrporsche4236]

You dont really get gains on the 911.On the boxsters you do because they are detuned in every way

[@racekar80]

3.8 S motor can gain some power by changing exhaust and using GT3 throttle body. This and a 93 octane tune and 200 cell cats can gain a few as well. Not much better than what Porsche has stock. My 997 S track car gained about 1 sec a lap at Watkins Glenn.

[@MotiveVideo]

Did you before and after dyno test any components individually ?

[@marcwilliams4014]

Gt3 throttle body has been done to death with very little or no gains. 93 octane? We dont get fuel that low in the uk no wonder you make shit power.

[@renneleven]

@@marcwilliams4014 from what I understand, octane rating and RON, how we measure it in the UK is slightly different. There is a discrepancy of about 4 to 6 octane numbers between the US and the UK. I’m happy to be corrected. That’s how I understand it though.

[@thesillyhatday]

Can confirm that the 986 Boxster 3.2 exhaust headers and muffler are junk. Don't need a dyno to feel the extra torque above 4000rpm

[@jagymeister]

I have 2.7 986 and manifold is total joke - funny log manifold😂

[@dekacster]

daaaawg what was that afr ? :D

[@mts9i494]

This is where you should be spending your time mate, stop pouring it in to you 6th gtr and put it in a car we would rather see

[@MotiveVideo]

Except the fact we run multiple GT-R events and GT-R videos get more views than anything on almost every car channel.

[@GRH316]

I’d be more worried about the IMS bearing

[@MotiveVideo]

They seem as blown out as proportion as RB26 oil pumps. I was told to worry about that and never had an issue even with triple the factory power output. Still don’t know anyone personal have a problem

[@hawksrock3024]

Less than a 10% fail rate. Way blown out of proportion.

[@Ravencof]

Whelp, I've already yeeted my stock mufflers, now to yeet the cats :D

[@og23457]

I knew it!

[@jakemate7583]

Nice

[@flytoday]

*cough* *cough* Turbo

[@S141VIA]

X pipe before muffler seems to be the trend for NA cars opposite for Turbo, NA Porsches don't give up power easily I managed to squeeze an extra 55hp from a 83 911 without opening my wallet too much 😅