>But we'll never know what they were testing... a US version M engine,
transmission, suspension, etc.
I asked two questions at M day (neither during the question and answer period because they wouldn't have answered it) to one of the M guys (I won't divulge which one). The first was: Is the rumor true that the E46 M3 will have world engine? Answer yes. The second was: WIll the performance be more, less or equal to the present Euro spec car? Answer, more.