I agree - almost. I think that "shout out," "roaring," and "back-fire popping" are a little strong. I have the Fabspeed pipes on my Cayenne and would do it again in a heartbeat. To me it just adds enough - not going to wake up the neighbors, but sure gives it a nice snarl. Do it - you'll love it. While you're at it, add the GIAC software. Since we have 2 - 2011 Cayenne Turbos - one with the pipes and one without - I have driven them back to back. The difference in INTERIOR sound is very slight.

does this "back-fire popping" sound come with a bypass only?
this is the sound that comes during downshift rite?

am driving the '12 cayenne S with sports exhaust but just cant get that sound on downshift...

I'm unsure if you can achieve the popping sounds stock, if so it's more subdued and less noticable to me. With the bypass it's all there I got the sounds at either fast speed downshifts like coming off the hwy, or if I was driving faster at higher revs, and then let off the gas.

Another thing to think about. Yesterday I talked Techart about these pipes and they said that doing so will confuse the computer and cause the car to not live up to it's potential. He said there are 4 o2 sensors and 2 of them are after the rear cats. I don't have my GTS yet so I can't verify this.

Translation, TechArt only sells full exhausts and not bypass pipes?

Yes there is that. Personally I don't understand the idea. The o2 sensors are there to adjust engine management and do so every few milliseconds, so why wouldn't they simply adjust to fit the new parameters? I'm not really interested in louder exhaust. Fine with me but not a reason to buy the pipes. What I really want to know is do they make more HP? If they do on a Turbo they should also do so on a naturally aspirated engine. Flow is flow. If the cats restrict it, elimination of the rears should help. I wish someone would do some timed 10 to 100mph test runs with and without the rear cats and report back. Not sure why they wouldn't want to test and see what their time and money is doing. Maybe I'll have to be the one to do it.

The power gains would be minimal enough to not really feel anything (or maybe even show up on a run like 10-100mph (maybe a tenth?). I'd wager you'd get 10 HP max on a N/A car, and I just can't see you feeling this, especially on a car as heavy as a Cayenne.

IMO, the only reason to buy bypass pipes would be for the sound. If I had a Turbo and wanted freer breather to go along with an ECU upgrade, I'd just do the full exhaust.

And it is possible they can hurt hp/tq unless near peak rpm as well.

I have the Sharkwerks and love it. Zero problems. The biggest improvement is the reduction in turbo lag, interior volume about the same. Lighter as well. No brainer upgrade in my opinion in any Turbo. I'd buy the used set one of the above posters has for sale.

I suspect Sharkwerks just didn't have the sale volume to continue selling them.

I was just looking into these today, funny this thread popped up. I found a youtube video with the fabspeed bypass on a 2013 GTS and it scared me. That sounds extremely loud IMO. Not sure how that compares to a Turbo...

I would love to hear one in person or find some other vids (which I will do now).

If any of you guys have them on a GTS (which already has a nice sound, but maybe a little too quiet) please post them up.

This is the video I was referring to:


I also listened to one on a Turbo... and theres definitely a difference. Seems like the GTS gets a little loud... thoughts?

Personally I think that is way too loud. A Cayenne is fast for a SUV, but it is no sports car or hot rod. A turbo will quiet down exhaust sound considerably by itself. Some people don't even run a muffler on diesels with a turbo. A friend did this on his Unimog and it was not loud at all.

People don't run mufflers on diesels because of the DPF. Muffler basically doesn't do anything.

I just put this on my S and Modbargains did a video of it. As soon as they have it ready, I'll post it up for those to hear. On an S, it's loud on initial cold start, but afterwards, not really noticeable at all with stock piping.

I quite disagree. I recently had my GTS on PIR and it was tons of fun.

If you look at the list of Porsches in my below signature, the GTS blows all of them away except three: 991S, 996TT and 930. Well, actually the 930 might be quicker but it's a real monster to handle around the track and not as much fun to drive on the track as the GTS. I do have PDCC and PTV+ on the Cayenne GTS and it is amazing the way it handles in the curves.

I'm installing the Fabspeed secondary cat bypass pipes on Saturday. Primarily for the sound improvement on throttle lift roll-off and downshift throttle blip, so I'm not going to bother with an A-B comparison of timed launches, making sure I have the same amount of gas, etc. Not sure the extra 10-13 HP claimed improvement will be noticeable anyway, but others above are very happy.

So I'll let you know if my seat-of-the-pants dyno and the width of my grin show any improvements.

Well that is good to hear. That they are fast. My GTS won't be here for a few more months so the only seat time I have is maybe 1.5hrs with test drives. I had them 4 wheel drifting but it's still a lot of weight. If I could get a decent power gain I would be willing to go full headers back to mufflers, no cats at all. At the moment I don't think anyone makes such a system. Do they? How about a set of headers? If someone does it could be done fairly easily. Headers to a custom header pipe with o2 sensor bungs, to a secondary cat eliminator with resonator to the stock tail pipe to an aftermarket muffler system. But then to fully recognize gains the ecu would have to be altered most likely. Seems that if it's not a turbo tuners don't pay much attention. Probably because gains are harder to achieve. Btw all commercial diesels I know of run mufflers and a DPF is a new development. Mufflers on a non turbo diesel make a huge difference in sound. I'm not sure what you are talking about AZN C300.