It is what's in my sig with dual 2.5" pipe coming off the headers into a Y then 3" pipe into a single in dual out Flowmaster with turn downs under the front of the bed. I love how it sounds as do most but if you are looking for quiet don't go this route (I remembered your earlier post about mufflers). It's not as loud as say a "bullet" style muffler but still pretty loud and resonance is horrible from 1500-1900rpm. Also, I think this muffler slightly disguises the chop of the cam. Other wise, I love it.