Added a new M2 test mule video to post #1.
Source:
http://www.2addicts.com/forums/showthread.php?t=1131305
This time (May 24, 2014 testing) we spot the same usual suspects of May 21, 2014 again:
M-HF5400 - M-HF5502 - M-KJ5136 - M-KJ5137
Would make sense if 2 manual transmission + 2 DCT
Red box mounted on the front of the test mules = lap time transponder.
May 24, 2015 (Nürburgring - Germany) (four M2 cars testing):