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Hey guys I’m facing some difficulties trying to find the right picht of sound for my x6m’s sound I’m not finding any exhaust systems that sound monsterous what do you guys recommend?

Morning Eric Welcome to the Forum Units such as Engine and Turbo are basically "dumb" it is the control units that are out of sync BMW also store mileage in two places the FCM/LCM and the ZKE mileage must be within 250 miles for each or you will get a tamper dot. Not trying to "teach Granny" as you have done a lot of work, have you checked YouTube there were a couple of pretty good "How Too's" there awhile ago for using INPA to re-program control units. Did you get the keys with the CAS unit? Or have the issues just started? I would use INPA and run a full diagnostic check first and Note any control unit faults Dave

Glad it worked out for you Dave