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I run a 2012 Wr 450 with a full exhaust system and the mapping tuned for max power works very well as a snow bike -- in the summer I turn it down for smooth power delivery doing mostly tight single track .
I have the Yoshimura exhaust and use the GYTR full exhaust map that comes with the competition ECU on the snow bike and use the lowest setting provided with the ECU in the dirt.
Last 2 seasons I had the bottom end turned right down and the top end set unto max for the best of both worlds, be cautious though it comes on very hard on the midrange if you do that ( that got me in trouble more than once in the tight steep climbs when she hooks up unexpected) for this season I will turn it down all the way top and bottom and see how that works. We do not ride enough open stuff o worry about top end around here.