WR parts on YZ

Anyone put a WR exhaust on a YZ? I'm really contemplating putting a 05 wr450f exhaust on my 04 yz450f. I need the spark arrestor and I'm not too worried about the power loss. Would rejetting be needed?

Re-jetting is needed almost when you change brands of air filter oil on these things --- LOL . I would assume a re-jet would optimize things

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