Gentlemen. An extensively researched topic.
I came up with 41 front and 43 rear psi which I run on my 335i vert with standard 225/35/19F and 255/30/19R kumho ecsta's nonrft/m-sport suspension.
Feels okay but think it can be better. Please post your numbers.
2007 E93 335i. Space grey. M3 19" reps. Matte black grilles. Lux V3. Cobb AP.