[CSBM5]

Originally Posted by wyatth

I’m curious if a slicktop or ZCP gives a bigger performance advantage. Weight loss helps in all aspects of performance and we know the ZCP differences are minor. Neither is noticeable on the street but here we are, people love or hate ZCP, they are either objective and willing to modify, or just prefer the best starting point that BMW created.

All else being identically equal, the slicktop non-ZCP will be faster accelerating than a ZCP with a sunroof (or a ZCP w/o a sunroof). The 359M wheels are heavier plus the sunroof weight -- simple physics on this comparison.
EDIT: Note that although it will be faster, the difference will be very small (obviously).