yes good info...
I always thought it was need..interlinked to the ignition/injection etc...
now to get a trail tec unit for the XTR. ====> http://www.ebay.com/itm/Trail-Tech-V...2c7371&vxp=mtr

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...