[Daftasabrush]

Originally Posted by mikkenoone

Look up your vin number and if you have it installed, there should be a "M" after the engine name.

Example of how it should look like
https://www.dropbox.com/s/wdxcvnz4b0...0340i.PNG?dl=0

M means medium performance. I.e. BMW could produce different levels of the same engines with different performance levels.