ok everyone, what is the best exhaust for the 2004 us spec S4 6spd ? with every aspect taken into consideration: hp gain, decibel lever (low, loud, deep, etc.), look, or maybe one that wouldnt void my warranty?

 

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I think this question was asked a few times within the last few weeks. Check the archives on this. Warranty isn't an issue with exhaust.

 

look at awetuning.com i think they got some good stuff for the new s4