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YZ ehaust on my 05 WR 450

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I'd say. I put one on my 03 WR450 and I noticed improvement over the stocker with the cork removed. It also sounds better. Quieter at lower throttle, but louder at higher throttle positions. You'll have to re-jet, but that goes for aftermarket exhausts as well. I got mine on ebay for less than $100, including the head pipe.

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