jtsrenn

Don't know the weight but it's supposed to save 4lbs over the standard roof. I have it and love the look,

F8Driver

Having done a repair on a BMW E39 sunroof, it was easy to lift, about 30 pounds. So given similar size the glass should weigh about 30 pounds, figure the drive mechanism another 10 ... so 40ish pounds? Compared to the Aluminum it replaces is maybe five pounds? So the weight is well above the CG and has a detrimental effect on ultimate performance. If you're tracking trying to get that last tenth of a second, fine, no sun roof. For those who will not track and use a sun roof often (as I have for over 20 years), it's the sun roof option every time. OBTW I'm no hairdresser.

aggie57

I doubt a sunroof makes 1/1000th of a second in lap times in the real world. If you're tracking a 992 you need a GT3.

CanAutM3

The weight difference between the CFRP roof and the glass sunroof on the F8X M4 is well documented at ~49lb. I read somewhere that the weight difference between the CFRP and standard Al roof on the 992 is about 2lb. So I would tend to believe that weight penalty of the glass sunroof over the base Al roof is much more than 5lb.

CanAutM3

I would disagree with that statement. At ~25 track days per year, I do track my car a fair bit, but it is also my all season daily driver. The GT3 is just too compromised for the latter.

aggie57

Fair point, I also daily my 992 and track it but only manage 2-3 times a year. But I stand by my point that deleting the sunroof makes an infinitesimal difference to lap times in the real world.

F8Driver

Sorry if my math was improperly presented. 5# aluminum roof versus 40# glass = 35# difference.