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If you have the rev extend and you un-install the ignition module make sure you disable the Rev extend feature!!! if not a CPS code will be thrown on the pc3 I think device error 69... It makes the bike have a stumble around 4-7k rpm!!! I called up power commander and they couldnt figure out why it was happeneing, i even ohmed out the CPS and even swapped the harness on the TB's but while i was just thinking about it the other night i remebered i had that rev extend enabled. Disabled the rev extend and it purs like a kitten! :thumbsup: