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2008 Big Bear 400 exhaust

rhull

By rhull
in Yamaha ATV Forum

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Ajmboy Grand Master

Ajmboy

Posted
Posted
Would I gain horsepower and have enough backpressure if I eliminated my muffler and ran only a straight pipe from my header?

I would probably weld in a performance muffler...running no muffler at all is not a good idea, can burn your valves.

  • 2 weeks later...

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