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Yeah, I could imagine it's a big penalty on the E92. I wonder what the difference is on the E90. I would think the CF roof makes around 10 pounds of difference vs. a plain steel skin just as an ass-pull guesstimate. Sunroofs are definitely the worst place to add weight to a car unless you put 50 pounds on a 10 foot pole mounted to the roof.
Negligible isn't negligible if it's more than 2 pounds IMO. If we're conservative about the estimates that seriousm3 posted, we just saved 100 pounds by leaving out the sunroof, audio, and fold-down seats. My gut feeling is that an E90 M3 with every option could weigh as much as 200 pounds more than a stripper with no options. I have an idea of what all the little googaws weigh by themselves (I've had a few of these god-awful BMW's, lol) but I have no data whatsoever.
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