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  1. X2 / X4 HMF Slip on Dyno Results

    X2/X4 General Discussion
    Started working on the Tuning today for the X2 and X4 using the HMF Quiet Slip on pipe. Pretty happy with the immediate results to be had with just a slip on muffler as we were picking up 6-7 rear wheel hp ( 15% rwhp gains ). Next week we will have the tuning available to be written directly to...