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👌🏽

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!!

Upgrading your exhaust with a turbo works really nice 😉

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

Loving the content Adrew. Thank you.

I absolutely love these Porsche vids! Great work guys

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

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

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! 🙌🏻

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

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

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

Always fun learning something new!

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

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

Very intelligent video, thanks

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

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

Great video

Cool video like always..

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 👍

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!

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.

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?

The intro slaps so hard. Lol

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?

Motive bringing the mang back 😂👍

Did it change the torque figure much?

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.

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

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....

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

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

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.

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?

283 cv with muffler bypass + cat bypass ?

what specs are the wheel and tire set up?

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

What's the weight of the vehicle?

daaaawg what was that afr ? :D

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

AES has done Porsche mufflers, great results...

Nice

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

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

muffler delete on 3.8 is amazing

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

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

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

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.

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?

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

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

I knew it!

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

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

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.

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🤷‍♂️

Make a part 2 with a X-pipe and cheap ebay headers

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

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

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.

I’d be more worried about the IMS bearing

Supercar KZfaqr's dislike this video

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.

*cough* *cough* Turbo

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

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

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

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 😅