I have a full yosh 4 into 1 exhaust and it is a little to quiet for me. I kind of got use to my race muzzy pipe that my zx11 had, looking for a trade for a more aggresive system.Maybe someone here has just the oppisite problem and wants to trade. I also have the stock exhaust for my 07' if anyone would be interested in the mufflers off it also. Thanks!