Originally Posted by Sticky
It feels much more nimble than my brother's F30, I don't know how much of that is due to size/weight and how much is down to the new bushings, control arms, power steering calibration, tires, etc. that the M235i in particular has. The tires are a pretty big deal IMO, especially since it comes with non-runflats from the factory so the bushings, dampers, etc. are calibrated to match. The M235i's ride/handling is so far ahead of an F30 335i with the same M Adaptive Dampers, it really felt like an entirely different caliber of car in that area.
And do your point about BMW's history with epic turbocharged 4 cylinder motors in F1, those things made peak power at 12,500+ RPM and were literally worthless below 10,000RPM. I don't doubt that BMW could make an even better motor than the already very good one in the CLA 45, but it's just nowhere near as pleasant as a straight six in terms of smoothness, power delivery, sound, etc. "