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Message: [QUOTE="Bud-Man, post: 26211, member: 20830"] Both of my KTMs ('00 200mxc, '01 125sx) had not problems with sealing at the cylinder. I've had all kinds of pipes: stock, PC & FMF. On the 200, the Gnarly made a huge difference. Among the most noticable changes I'm made to my bikes. It added low and mid power with out hurting the stock. As stated before, you may have to adjust your jetting to get the best from the pipe. You can't go wrong with it as a replacement. It is much stronger than the stock pipe, but you will still need some type of pipe guard to protect it in the worst of terrains. Like you, I wanted more high rpm power than stock but couldn't find a pipe that advertised this. The latest PC add boasts that it adds top end to the bike, so that my be a worthwhile replacement as well. Good Luck! [/QUOTE]