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Measured horsepower of YZ450F?

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Anybody have dyno data from a stock YZ450F? What pipe seems to the best for an 05? Looks like the factory has a step header pipe, just like my drag stuff from 15 years ago!

Thanks for the input, Dennis Baccus

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The most brute force is the Jardine. The best all around and smooth pipe is the Factory 4.

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