Last summer we told you the M4 would be powered by a turbocharged inline six. We know from several sources that that engine will be based on the 3.0L N55. Now we have some further confirmation. Some enterprising gentleman on Bimmerpost did some detective work and reverse engineered his way to finding out a number of details about the upcoming M4. In doing so we have some confirmation on several aspects of the car plus a few new details – including the all important engine code.