yz450 questions

would a yz450 exhaust work with a wr450? would it need some rejetting? with only 4 speeds; how fast can you go comfortably and how fast really wound out. what's the horsepower rating on the stock and modified yz450s. for trail riding with an advanced rider would it be suitable?also,any one know where i might find detailed specs for the yz450f and wr450f?

thanks

umm hp on a stocker is rite close to 50 at the rear wheel i believe.. 48 er something like that and with a highly modified one theres guys getting 60+ from what i've been reading.

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