Thank you very much for the answer.
However, if the "cat" is defective, removing them still doesn't gain the extra hp I mentioned?
What about the sound? Will it be any different (eg close to 4,6is or 4,8is sound?)
What is the realistic hp gain from removing the cat?
Quote:
Originally Posted by Wagner
Cats out =
- stank exhaust smell
- no hp gain unless you're also changing out the mufflers
- check engine light
- O2 sensor warning
- failed emissions
Even if you went to tubed headers, CAI, straight pipes and race mufflers...you wouldn't get 20 hp. BMW engines just don't do that, they are already built at the top of their game. Changing out the exhaust on a M3 wouldn't yield that, let alone a X5.
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