PPFANBOY

Hi all,

I feel that the exhaust note on these cars is the only thing that is lacking. I have the sports exhaust on my 992 TTS and although it is nice, there is room for much more aggression.

Can we share write ups and videos of exhausts that people have fitted? Please state whether exhaust only has been changed, or exhaust with sports cats, exhaust with straight pipes etc.

I think it is a good idea to have them all in one thread as a reference point.

Cheers!

riotgear

I have a JCR exhaust and cats on order. I’ll post videos here after installation.

PorscheSince2013

I think the thing to keep in mind is that the TTS is unlikely to sound similar to a NA engine, even with a new exhaust. New cats and exhaust will deepen and strengthen the overall sound, and highlight some of the pops/crackles, but you aren't going to get the same scream above 4000.

The valves are complex. and they open and close dynamically, I assume to optimize exhaust velocity. It may be the situation that greater flow may result in lower performance.

My new cats and exhaust definitely make the drive more involving. At times, you can feel the exhaust resonate through your feet. The spinning of the turbos is great. It is a different experience compared to a NA engine. I am still getting a feel for it.

Pad Bender

JCR cats installed and exhaust on order...should arrive any day now.

hcvone

In Sept Kline headers, Kline 100 cell cats and Kline valved exhaust in inconel. Will be on video on it's Cali vacation.

AIM Performance

We have 1 Kline 992 exhaust available for immediate , no wait

speedyj

any issues with cel?

Pad Bender

I had a cel ..sport plus pull in -11c weather...."p420" (catalytic emissions efficiency) cleared with torque lite app. No issues under normal conditions.

They are sending another sensor when I get the exhaust.

SB27

Will report back over the weekend as to the sound / feel.

TumbleWeed is the first (I think) to do this. Look forward to confirming his solid initial reports and to being as happy as he clearly is with the GMG setup.

I think you cannot go too wrong with any of the vendors here unless you go crazy (full headers, full cat delete) and invite constant CEL's. That's not GMG's setup.

It really comes down to what sound do you like. I love my Soul Sport Cats on my 991.2 GTS Targa 4. Amazing. Perfect.

I loved my GMG center exhaust on my now departed 991.2 GT3 (more of a "mechanical" vs. "melodious" sound).

Will report back on the setup on the 992 TTS this weekend.

:-)

PPFANBOY

Looking forward to the updates.

I had a KLINE inconel setup on my 991.2 TT. Wondering if it will sound similar? Although I loved it I would like a different experience this time around..

PPFANBOY

Well stated but I'm not after a NA sound. I love the turbo whistle. I think most people that play around with the exhaust are after a more aggressive note with more of that sweet turbo whistle as the stock TTS even with sports exhaust is fairly sedate.

pfbz

Exhausts are very subjective... And while i have zero firsthand experience with 992 Turbo exhausts, I can say i went through three permutations on my 996 Turbo and five permutations on my 991 Turbo S before getting the volume, tone, and overall sound I was looking for.

On the 991 Turbo S, which I suspect is closer to the 992, my personal winning combination was the Soul competition exhaust and separate cat bypasses. Definitely some exhaust volume (without being obnoxious) and that higher pitched 'wail' when full throttle above 4k RPM. Enhanced turbo whistle. Interior noise is still muted enough that I'll roll down the windows or open the sunroof when I really want to hear the car, more than pleasant at cruising speeds on the highway.

But again, YMMV! I've heard exhausts that others loved and I personally couldn't stand, and it's more than possible that others would dislike my current setup.

Also, zero CEL's on either car with simple 90 degree rear 02 sensor spacers.

SB27

Okay, gents. I picked up the 992 TTS with the full GMG exhaust installed by my dealer. I swapped my OEM SPORT Exhaust for the full GMG system. Comments here:

POSITIVES

1. Goes like a bat out of hell in Sport mode. There is no question to me that the car has picked up much earlier turbo spool (I think GMG dyno'ed it at 70 more Lbs of TQ?). Crazy / explosive speed when you hit it.
2. The sound in Sport is intoxicating and darn near the wail in my 991.2 GT3. Of course NA always > Turbo, but still damn impressive.
3. The rumble /sound is deeper at idle and in low power the "cruise to the restaurant" sound is deeper but still manageable. The Wife didn't notice that I had swapped the exhaust (I was nervous about this). If you putt around town at low speeds in normal, there is definitely more deep hum vs. the OEM Stock Sport Exhaust in Normal but it's still relatively manageable.
4. In short, I think it's a no-brainer for those of you that want better sound, more speed without messing with the ECU/intercoolers/turbo's/fuel type/whatever. If you mainly drive in aggressive mode or your wife is always in "don't care mode", then this is a No Brainer.
5. No real drone at highway speeds in Normal mode. You do pick up some drone in SPORT mode at highway speeds -- which I expected.

NEGATIVES

1. On startup (1.5k RPM) for one minute, it is definitely louder. Yes, it starts in normal mode. When it drops back to idle (750 RPM) after one minute, it goes much quieter.
2. Exhaust is deeper. Across all settings.
3. You lose the "full stealth" quiet of Normal mode.
4. You lose the "whistle" and "soft burbles" in Sport Mode (not all of it / but some of it).
5. Sport mode in Stock Sport Exhaust had a nice rumble to it -- plus lesser/deeper whistles / burbles -- some of that has been replaced with a deeper / angrier sound.

NET-NET -- a spectacular upgrade in terms of speed and sound. Like all other good things, there are "give ups". I think it's worth it. Go for it and when you nail it in SPORT mode, get ready for all BLEEP to break loose. It's crazy.

zmansbr

Trying to decide between Fabspeed Sport Cats and GMG Exhaust System for 992 TTS. Never done this before and am exited to do this mod.

Correct me if I'm wrong but with GMG's full exhaust, you lose the PSE button as there are no valves. They rig them up to stay open? I guess less parts or things to break but I like the ability to close the values.

Fabspeed claims 54.9HP peak HP gain on dyno with sport cats. Why is that about 2x any other cat system or full exhaust out there? Aren't they sourcing very similar 200 cell guts?
Doesn't seem Fabspeed has yet tested or posted gains with their cats and center exhaust combined. Anybody have this? CEL? Will there be challenges with emissions testing on that combo?

Super hard to pick based on sound on YouTube videos. Anybody heard them both? GMG sounds a bit more intense on YouTube listens.

PorscheSince2013

Replacing cats alone is going to be rather subtle. A little louder, but you need the exhaust to change the tone.