I just purchaced 04 WR450 please help

I own a 2002 WR426 and it is wicked. I bought the 04 wr450 because of the great deal i got and electric start. I have a problem though on my 2002 426 I have pro-circuit t4 exhaust system. I was wondering if I could trade that exhaust over to the new wr450? Also I was wondering if i were to buy new pipes if the wr aftermarket pipes the same as the yz450 aftermaket pipes, as in size and dimmentions. will they fit. please help if you can. Thanks :)

they SHOULD (YZF / WRF ) be interchangable >> emphasis on SHOULD.

All the applications on the 04's I know of are the same. :)

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