Porsche 964 Turbo Exhaust - Page 1 - 911/Carrera GT - PistonHeads UK

I'm gonna upgrade the exhaust (what a surprise) on the above car. Problem is, what the HELL is going on down there? Can someone explain how the OE system works - and what I need to replace to get a strong sound and more power? There's f**king chaos down there - a cat, heat exchangers, turbos, silencers, - what's going on and what do I need (silencers, U-bend, extra loop - bloody hell!) Any help will be hugely appreciated! MB

or

I need more help. I need more HELP!!!!

Ah, First picture is a replacement for the muffler in the back. The second picture is for a replacement of the muffler on the right side. You can do both but it will be noisy as hell, inside and out. Both are a cheap option to start with.

Thank you PTT. SHould I de-cat/sport? (in fact does the car even HAVE catalysts?)!

Don't known if you have a emission test during MOT than de-cat is a no go. You can try a 200 cell cat. No cat on the Wastgate dump pipe is a nice option, the car will scream of joy at high refs.

There's no "muffler on the back" on a 964 turbo. The bit on the back, just after the turbo, and behind the rear bumper is a catalytic converter. You can get bypass pipes but I would guess that you won't get through an MOT without the cat. The longer pipe in PTT's post looks to me like a muffler bypass for a 964 rather than a cat bypass for a 964 turbo. There's only one "muffler". That's the one that sits behind the right hand rear wheel. Same part as on a 964 and can be bypassed with the small G-pipe in PTT's post. You can also get a 'swan neck' which is much the same but longer. The left hand tail pipe is connected to the turbo wastegate via a small cat. I think I've seen bypass pipes for this as well but I'm not sure what purpose they serve. It's been a while since I looked at what was available. If I remember it correctly the heat exchangers are quite restrictive so if you're looking for good power then you probably need to replace the whole thing rather than just bypassing a few bits. Back in the day I think that some people modified the heat exhangers off of a 3.2 Carrera so that may still be an alternative. Fabspeed, Turbo Thomas, Haywood and Scott and B&B are the aftermarket ones that spring to mind. Some of these may well be designed for the earlier turbos rather than a 964 turbo and when I was looking fitment issues seemed common. I ended up going with the standard parts and replaced what I had which probably cost me more but it fits properly and, hopefully, will last another 20 years or so. I did junk the air injection, though, as it does nothing other than sap power. Duncan

FunkySon said: There's no "muffler on the back" on a 964 turbo. The bit on the back, just after the turbo, and behind the rear bumper is a catalytic converter. You can get bypass pipes but I would guess that you won't get through an MOT without the cat. The longer pipe in PTT's post looks to me like a muffler bypass for a 964 rather than a cat bypass for a 964 turbo. There's only one "muffler". That's the one that sits behind the right hand rear wheel. Same part as on a 964 and can be bypassed with the small G-pipe in PTT's post. You can also get a 'swan neck' which is much the same but longer. The left hand tail pipe is connected to the turbo wastegate via a small cat. I think I've seen bypass pipes for this as well but I'm not sure what purpose they serve. It's been a while since I looked at what was available. If I remember it correctly the heat exchangers are quite restrictive so if you're looking for good power then you probably need to replace the whole thing rather than just bypassing a few bits. Back in the day I think that some people modified the heat exhangers off of a 3.2 Carrera so that may still be an alternative. Fabspeed, Turbo Thomas, Haywood and Scott and B&B are the aftermarket ones that spring to mind. Some of these may well be designed for the earlier turbos rather than a 964 turbo and when I was looking fitment issues seemed common. I ended up going with the standard parts and replaced what I had which probably cost me more but it fits properly and, hopefully, will last another 20 years or so. I did junk the air injection, though, as it does nothing other than sap power. Duncan Thank you, thank you, thank you!!!!