Originally Posted by M3takesNYC
Considering the S55 is designed after the N55 I don't think they ever went back to any drawing board. That only happened one time and one time only and that was with the s85 and s65 engines. Truly only bespoke engine's ever in a bmw
I dunno - they went air to water in the S55. With a big enough radiator, it should outperform the air-to-air IC in the N55 (unless your running a very long time). Similarly, I imagine the oil cooler is quite beefed up. Will never be an S65, but I bet they sort the heating issues out in the M.
- Guy who sold his 335i and is waiting for his '13 M3.