Measured horsepower of YZ450F?

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

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

My "off the showroom floor" 04 YZ450 made 45.5 RWHP. Oh yea, my bike also has a Jardine pipe :cry:

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