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  1. Slip on: Power Commander/Map needed?

    Sportsbike Forum
    <This question applies to my husband's 07 GSXR, but I think it's generic to any sportbike>;) We ordered an M4 slip on (which is a two into one slip on). He really just wants the noise/sound, not too loud, but more audible; the look is nice too but secondary. He doesn't care about getting...
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