Folks have told me it depends on what exactly you want. I ended up getting the white brothers e series. You can tune it with discs which it convienient when I want to quiet it down around the homestead. The power gains were significant, although I did lose a bit off the top end. Somethign that I'm sure a little jetting will fix. Best thing to do is find folks with XR's and different pipes, try 'em.
I highly recommend Thunder Alley pipes. I got one for my XR250 and I've never expeienced such a substantial power increase from an after market exhaust system. The web site is: www.thunder-alley.net
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