If you just want a middle of the road pipe for decent performance that is easy on the wallet, I would recommend FMF or Pro Cicuit. If you want performance for track or trail, you are probably looking at a little more cash with LRD, White Brothers, DMC, Denton, Yoshimura or something along those lines. It is hard to say without knowing what type of riding you do. Not sure where you live so can't help you with place of purchase. I have always had good luck and been pleased with FMF, I am running one on my warrior and it works great. Remember that there are some noise restrictions if you do any woods riding. Hope this helps. 8)