MrMCar· Premium Member
E30M3 Race F10 535 R1150Rt M Coupe
That's always been the conundrum for me.But why? The coupe glass is much bigger than the sedan glass. I’m sure it’s heavier, too.
The ONLY answer I have come away with (and it's not even a good one) is distance between two uprights and possibly better weight distribution, creating less twisting on the up/down?