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So I have an 01 yz250f and my buddy has a 99 yz400f and it blew up. He has a powercore 4 muffler on it and it will bolt right up. If I get it off of him will it make a differance since it's made for a bigger motor?

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Sounds like a fun project for the the man cave, Can't hurt to try it !

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I don't see it making a bit of difference. What would make a difference is if it was a full assembly. From header back. Then you would also need to adjust jetting I would think. If I am wrong I am positive someone else will correct me.

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