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As Brian stated BMS or Dinan piggyback will not remove cel, I had the BMS for about 7 months before I got the AMS ecu tune. I am running AMS catless down pipes as well did not get cel light until like 150 miles on car, like everyone you get use to it. Only cure was the full ecu tune
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2014 M6 Gran Coupe, Strasse Forged 22", AMS DP, H&R Springs, Vorsteiner Carbon Aero Lip, IND body parts, side markers, carbon mirrors and spoiler, carbon diffuser.
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