Wow, bet that was unexpected, eh?

If anyone has ever wondered about the general layout of the M111 Kompressor engine this video is self-explanatory as long as you have a knowledge of automotive components. The only bit I was unsure of appears at 2:08. That's the electrically-operated supercharger bypass valve (I don't know the actual name!) which either routes air into or around the supercharger. In the USA the M111 engine is fitted to most Mercedes-Benz labeled "SLK/CLK/C 230 Kompressor". However some vehicles with an M271 engine carried on using the '230' label even though they were only 1.8L.

Here are the head to head stats for a 2002 SLK230 vs a 2002 SLK320, each fitted with a 5spd automatic.
SLK230: 0-60 7.7s mpg 23/30(25)
SLK320: 0-60 6.5s mpg 20/26(22)