I just tested my M2C against my bro M340i Xdrive, after several passes the best time for the M2C was 12,96 against 12,6 for the M340i, the new G20 is a beast, it pulls from the line like a freighter, after driving both cars I can say the new B58 engine its way better than the S55, the sound is way better, so much that you don`t want to hear the rasppy S55 again, both cars have downpipes and were tested in the exact same place, the time corrected for the slope was 12,52 (m2) vs 12,32 (m340), be aware that this test was performed at over 9800 ft so times are about a second slower than at sea level. The M2C was tested at the dyno and it throw 479 whp so respect for the new M340i.