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06 WR450F with YZ426 exhaust

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I don't know if this is common knowledge, but while uncorking my WR450 the other night, my buddy pointed out that my exhaust looked a lot like the stock exhaust on his YZ426. He went to the basement dug it out, an dwe sized the two up. The bolt holes were off by a mm or so but it will fit. I put it on and gave it a try. It seems to work great, other than being really loud and not having a spark arrester. Does any one know why this would be a bad idea? It didn't seem to throw the jetting off (the jetting that came with the AIS removal kit), and it is about half the weight of the WR unit.


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