[lavaletta]

Originally Posted by 1SerieStud

So far it's been documented that the piston rings are different, the flywheel is different, DME mappings are different, intake is different, and exhaust is different. In addition, the 6MT is the revised transmission found on the 2011+ car, which is already an improvement over the 2010 and older manual transmissions.

Sure, the core is an N54 engine, but anyone saying that his/her 135i N54 is identical, is in some major denial. Clearly the N54 going on the 1M was tweaked to better suit the task at hand, which is powering a car worthy of the letter ///M

Well said, sir!