Bass,
Talk to your tuner about the Magna Flow mufflers, i was going to do the same thing but he told me to go jap and jap only, so i got an Apexi N1, its not to bad but still quite loud...
i suggested a few 3inch twin muffler systems but i think the attraction from the EPA your getting is becasue of your race cat, i have one as well and the car is quite a bit louder because of it.
I bought a silencer for it on long drives and it shuts it right up and still goes well, but not as well as without it!! just be careful you dont lose any power over the different exaust and have a chat to Ben about it before you chose a different exhuast...