I heard a leo vince pipe on a busa. It sounded pretty tough. Before I buy exhaust I always go to power commanders sight and see what maps they have. If they have a map for the exhaust, then it probably gets you more power. I think leo vince is on there. I just got done getting a pipe though, and for the dollar, muzzy was the best bang. 505 for the ugly round pipe,(what I got) or 650 for a modern style oval pipe. I currently run bolt on carbon fiber muzzy now and I really like them. There about twice the sound of the stock pipes, unless your above 5 grand. Then there semi aggressive. Good luck, let us know what you end up getting.