WR pipe on a YZ

If you wanted to put a gutted pipe from a WR 400 on to a stock YZ 400 is there something you will need to do to the jetting or is this a bad thing. We need the spark arrestor from the WR pipe and we dont have the money for a FMF mega max. Anyone have any ideas or advise

I dont really know if theres a drawback or not , I'm testing my password.

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