Quote:
Originally Posted by ApolloSki
@ SirBrass is right. 2.5" with a catless header is already going to be pretty loud when you step on it, but who cares cuz racecar! Hopefully you've done a little insulation. 
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Catless JDL UEL header is why I capped my engine-back exhaust (got a hfc + hemholz in the np fp/op) with an invidia q300. It's still QUITE audible when you apply gas, but not too loud, and really very very pleasant to listen to.
Stock exhaust is next quietest, I think. That or the Greddy axleback. All of the other AB's and CB's will just make it louder. If that's your think, okay, but you don't have to have it monstrously loud without screwing up your performance either.