Carbon fiber has definate advantages over fiberglass in strength and durability. It's also slightly lighter. The thing is, a hood does not need to be exceptionally stiff, if you have a lightweight metal frame in the hood, you can use the original hood latch, and still come out up to 40lbs lighter than a stock hood.
My 924 has a 40lb steel hood, I can replace it with a glass hood that weighs 10lbs with a metal frame, latch assembly and paint. That's 30lbs off the front end. With a carbon fiber hood, I could spend $300 more and get a 7lb hood. 3lbs for $300? No way, I could do my bumpers for that much and get another 50lbs of weight savings. So 80lbs or 33lbs for the same money... Tough choice
