Machine - i put a speedwerx pipe on my sled just last month, so i haven't really gotten to use it, but it does sound better than stock. not much louder, but it has that "tinny" sound to it. their pipes also come with ceramic coating on the pipe and the new y-pipe, looks real good. speedwerx claims 7-8 hp on efi's and 8-9 on carb models. d&d is the only other company with a pipe for the efi's, that i know of anyway.
hope this helps, late, matt
I would try a clutch kit first before a pipe. We do have a 01 zr 800 with our clutch kit in it for speed running. it runs well. 108-110 in a 1000'ft check out our website www.cseracing.com email any questions you got we will glady help you out. my father could explain more about the efi and pipe questions.
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