Though no more cosmetically revealing, these photos show two F10 M5s in testing of both a V8 and V10 engine!
This is revealed to us by Scott26/7. However, which engine it will receive is not yet known. What a beast of a car this will be, regardless of which engine is chosen.
Read the rest of this article, view the photos and make comments here ==> http://f10.5post.com/forums/showthread.php?t=292501