I got a Greddy SP with 2.5 " piping. They no longer make this exhaust. It is quiet yet sporty and not ricey. I painted the chrome muffler black and cut off the 4 " inch tip for stealth. In place of the tip, I found a 3 " tip from Manny, Moe, & Jack and had that welded on. It looks totally stock and I have never been pulled over with this set-up. I went to all of these lengths after getting an expensive smog ref. ticket with a very loud 3 " Tanabe N! system. If I didn't go this route, I would probably look at DC, RSR, Thermal, or the Mugen dual pass muffler, which most people rave about.