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I'd say you'll probably be fine running the Yoshimura map. The big difference in A/F comes from changing the intake, the exhaust is minimal (Between one aftermarket and another). It will be a little on the rich side because you're only running a slip-on, but not by much, and that's not necessarily a bad thing.
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'08 KFX 450r, Black.
Motoworks SR-4, CFM Aluminum intake box/tube, Custom EHS lid, K&N filter, PCIII, Fasst Flexx bars, Elka System 5 stabilizer, black Pro Armor Fat Peg nerfs, black Pro Armor Dominator bumper, Pro Armor kill switch, Pro Armor swing arm skid, JnJ frame/a-arm skids, Pro Armor billet case saver, Pro Armor billet shifter, 15 tooth sprocket, ITP Holeshot HDs, Factory Effex Metal Mulisha graphics, Black 2" header wrap
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