I have good things about them, they are tuneable and they seem to last along time. I think that they are probably the best perfomance exhaust you can buy. They do however cost a few bucks, $150 for non-stainless, more for stainless. I almost bought one, I called the people at supertrapp and they said one would work great, but you would have to have a custom pipe bent for the rest of the system.