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Message: [QUOTE="KXtrailrider, post: 1074509, member: 55930"] I have a 99 KX 250, I use a pro circuit spark arrester all the time. For a pipe I have used a pro curcuit, a stock and a fmf gnarly, The pc is ok, the stock is best for top end and the fmf is best all around pipe.I also use a 310 cylinder and get the same results. I currently am using the 310 with the fmf and pc spark arrester. For my bike this the best over all setup. Good luck. Ed [/QUOTE]