He is full of bull. When you code a DSP amp, it is immediately correct. It does not require "50 - 100 miles" of driving. That is nuts. (I have coded several myself, and I know exactly what is involved.) I would bet he got a used amp, or he never coded it.

What is the part number on the amp? A new one should cost about $1,100 from a BMW dealer and be part number 65.12-6 940 977.

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