I was planning on buying a preformance muffler because i dont plan on doining a whole lot of engine mods and i dont want to get a cat-back because i heard you lose torque. Has anybody ever used a Tenzo R touring series muffler? How does it sound and does it increase hp at all? i found one on ebay for $100 good deal or not? http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=583394230&r=0&t=0