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04 YZ450F exhaust install on 05 wr450f

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Will my 04 YZ450F exhaust fit and work on my brothers 05 WR450F? He is afraid of a little noise and wants my stock pipe. Any help is appreciated! Thanks! 

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Yes fits with no issues.      This is actually a good low-price exhaust upgrade for WRs.

I have done it to all eight of the 03-05 WRs in my fleet and while can be a bit noisy the engine definitely

appreciates the better flowing exhaust.

As with any exhaust change you will need to adjust your jetting.

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