I would deffinatly start with the exhaust gasket. The kit gaskets are crap and I have blown more than I can count, I have started making my own gaskets out of high temp teflon that I hand cut...Kelly

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I'm racin' Spitfire, turnin', poppin' wheelies, burnin' evil chasin' pop,pop, pop,pop,pop.... (The Pixies-Tony's theme)