Something that Ilia@IND said in the "1M Exhaust system database" thread that I thought would be helpful to this discussion (I bolded the relevant parts):
Quote:
Originally Posted by Ilia@IND
The OE exhaust system has the same decibel levels as the Eisenmann Sport system. ECE homologation requires that any homologated and approved exhaust system have the same decibel output as the factory exhaust system. Eisenmann's Sport system modifies the sound and tone of the car drastically, but retains the factory volume output making it completely road legal in the US, as well.
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Her post can be found here:
http://www.1addicts.com/forums/showp...5&postcount=44
So it sounds like you probably shouldn't opt for the the Eisenmann sport exhaust if your goal is to get an exhaust that is louder than stock?