Just purchased 05 Cayenne Turbo and have a few ???.

1. Do 2nd cat bypass pipes help or hurt overall power? I've read it helps and hurts. Does anyone have dyno numbers before and after??
2. What is the max bar a stock TT should reach? I'm hitting .8 bar!
3. What intake is best...is it better than stock+aftermarket filters???
4. What mods will Dealers install(tune,diverter valve, intake,2nd cat bypass) without voiding warranty?
5. How much power can you expect from v-flow+2nd cat bypass+diverter valve???

thanks for the help!!

 

1. They help it. Helping motors breath better almost always increases hp and torque. Turbo engines like it even more Fabspeed ran a dyno and gained ~25hp and ~20 ft-lb torque w/ intake.
2. .8 is the max... that's why the gauge goes up to .8
3. The best intake is the V-Flow by Evolution Motorsport.
4. A dealer cannot legally void your warranty simply because you modded your vehicle.
5. Probably around a 30hp gain. It may not sound like much, but these mods will increase your throttle response, which is a difference you will feel.

 

Thanks for the info! I asked about the boost levels because I read about some TT's only going to .6 bar.

I think I'll start with the cat bypass and intake!