Straight Pipes

[AVIA8R]

I'm considering removing the muffler from my 04 Cayenne Turbo. I already have the RennTech secondary bypass pipes, but would like the car to be louder. Has anyone done this?

Matt

[Dennis C]

I'm considering removing the muffler from my 04 Cayenne Turbo. I already have the RennTech secondary bypass pipes, but would like the car to be louder. Has anyone done this?

Matt

No muffler at all? I think that would be very loud... perhaps not even legal...

[mudman2]

Dont you still need some exhaust backpressure with a TT?

I'm considering removing the muffler from my 04 Cayenne Turbo. I already have the RennTech secondary bypass pipes, but would like the car to be louder. Has anyone done this?

Matt

No muffler at all? I think that would be very loud... perhaps not even legal...

[AVIA8R]

Well, though my experience is with other turbo charged cars, I've removed cats and mufflers from three other turbocharged vehicles and....

1. They made more power with the absolute lowest backpressure (post turbo). I don't believe "backpressure" after the turbos is important at all since there is so much backpressure before the turbos. Even at full boost (minimal backpressure pre-turbo) there will still be sufficient backpressure. Like I said, with three other cars, more power was gained when the minimum amount of post-turbo restriction was achieved.

2. The turbos act as mufflers and I still have the main cats, which also act as a muffler. I'm not sure how loud a Cayenne Turbo would be without the rear mufflers. There's a You Tube video that's labeled Cayenne Straight Pipe (or something like that) and it's not what I would call too loud. If anything, my Cayenne Turbo is WAY TOO QUIET now. And the Cayenne as SO MUCH insulation, I’m thinking it couldn’t' get too loud. But, I would like to talk to someone that's done it.

Thanks to you both for the reply. :renntech:

Matt

[RFM]

The turbo charge pressure will slightly increase with decreased back pressure (mufflers and cats removed).