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yz450f exhaust on a yz250f

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The header will not fit. If you use an 06 YZ250F header, then the silencer might fit with a midpipe gasket for an 06 YZ450 (assuming you want a stock 07 450 silencer). You will also have to move the location of the mount on the midpipe.

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why is everyone telling me on my thread that it isn't possible? I have an 04 250f and plan on trying an 07 450f silencer. from what I understand, I may have to have a sleeve/gasket type of thing and the mount will be a little diferent but otherwise it should work right? what about re-jetting?? will it need to be done or is it gonna run normal without it? pros and cons of the idea? looking for anything and everything, I'm sure it will help the guy out that posted the thread as well.

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why is everyone telling me on my thread that it isn't possible? I have an 04 250f and plan on trying an 07 450f silencer. from what I understand, I may have to have a sleeve/gasket type of thing and the mount will be a little diferent but otherwise it should work right? what about re-jetting?? will it need to be done or is it gonna run normal without it? pros and cons of the idea? looking for anything and everything, I'm sure it will help the guy out that posted the thread as well.

I replied to your thread.

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