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you will find the model year introduction docs given to the dealers, it is a handy way to track differences
2010= subject to stricter emission regs and penalties for tampering.
come with catalytic converter- different o2 sensors and change in the tranny gear cut ( helical 5th?)
I purchased a 10 Ultra but after the fact wished I would have purchased an 09 because of emmisions and the hassle of removing the cat. No big deal now and I will probably have a different bike by the time they enforce the emmisions.
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