Originally Posted by aajami
No consensus yet. Most speculations revolve around a bespoke 3.3L I6 or a 3.3L V6 derivative of the S63tu, with either two or three turbos.
If BMW follows the same idea in how they derived the S65 from the V10, then we can only assume that since the new M5 engine is a 4.8 TT, then the new 6 cylinder for the M3 will be a 3.6 TT.
Just my .02