well, you were mentioning the V8 in the M3 and the V10 in the M5, but I know the IS has the DCT as an option (and I believe some Z4's might as well), which sounds like it could be a better fit, since those cars deal with an N series motor.
as far as programming, I don't know how that's handled. Have you checked realoem diagrams yet? maybe there is a part number. Ok, I just checked, and it isn't obvious if there is a separate computer for the trans. But a new DCT will set you back about $10,000, so start checking out those salvage yards!
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