Wr/yz Exhaust Mod

I'm sure this has been posted, can't seem to get an exact answer. I have an 04' stock YZ pipe I want to install on my 05' WR what do I have to do to jet properly. How do I re-jet? Is it difficult? I'm a beginner. Thanks

Why do you want to make your bike louder?

More sound = less ground.

If you are going to motocross it,why wouldn't you just buy a YZ ?

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