Bought a 04 wr450 - have a few questions

Hi, just bought a 04 wr450, which is also my first road legal bike.

1: A friend of mine has a set of ktm 640 sm wheels, has anyone tried fitting these to the wr? If so, what needs to be done to make them fit?

2: Does the rear fender from a yz450 around the same year fit?

3: I have fmf factory 4 exhaust, and the thing is LOUD! Even tried repacking the muffler and add the quiet core insert, but it didn't seem to help alot... Any suggestions for a quiet replacement muffler?

I hope you understand my poor english writing :)

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