Originally Posted by kmarei
$50 says its a 3.3L V6
i.e an M5 engine with a quarter chopped off
let me know when you heard that before...
THIS. Exactly what I was thinking.
They did the same with the previous E60 M5 V10, chopped two cylinders off, tuned it, and put it in the E92 M3. I wouldn't be surprised if they did the same from the current F10 M5 (V8TT) to the future F80 M3 (V6 TT).