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wr450f need advice

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If i was to put a D&D pipe from an r1 per say,would i have to rejet my carb? I think i will have to but im not up to par on the new ones. I have a 2006 wr450f yamaha. Im at 0- 1000 ft from the big blue here. What i was thinkin is too shim the stock jet up some and make it a little richer. An help would be appreciated. Thanks guys.

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