http://speed.academy/10-myths-of-cylinder-head-porting/ Web20 feb. 2015 · That can smoothen the sound emitted at the tailpipes, and can improve performance slightly. An X-pipe merges the two head pipes at a junction. It improves exhaust scavenging but also gives the exhaust charge two paths in which to exit. I have found that an X-pipe offers at least some advantage in most engines.

Head porting All Motor Hayabusa Owners Group

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Mmad Porting YFZ Central

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