i might sound cheap, but i just got the hipower muffler from HKS, and then had it put on, in place of my stock. my car sounds GREAT. one of the best sounding cars in town. and i think total i spent 280 with installation. i could be wrong, but i know i only paid like 230 give or take for the muffler, and like 50 for install. just some food for thought.