i went to the local auto parts store and picked up a raptor muffler for 15 bucks, i know it sounds cheap and well....it was... but i'm totally happy with it, it just gave it a slightly deeper rumble that kinda filters out at higher rpms....i was just looking for something so that you could hear it when i downshift, because the intake i have sounds pretty mean when i floor it. but yeah, the raptor muffler sounds awesome, its not too much at all.....howver if you have to have something a little more well known, the dynomax super turbo is also what i would reccomend, its basically the same deal, sounds a little louder but filters out at higher rpms i had one on my old civic, it was the perfect balance