FMF Factory 4 for 426, will it fit 450?

Hi, I recently bought a '04 WR450, does anybody know if the FMF factory4 with power bomb from my 426 will fit my 450? It looks like it will fit no problem, but will it run alright as I noticed the part numbers are different for the 426/450 ?

many thanks :)


Well, it fitted on the bike but run like a pile of dog poo! think it was running lean, can i buy a jetting kit to fit to match the exhaust or is it trial and error?



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