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I recently bought a nearly complete 92 KX 500 parts bike for $250. Awesome deal I know. It came with an FMF Gnarly pipe and an FMF power core silencer. What kind of Jetting issues can expect when I put those on my bike? Everything is stock right now. I'd also like to know what the difference is between the FMF silencer and the stock silencer. They look to be pretty much the same thing to me. Does that FMF sticker make it run better?