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I know some realize this already but I should point out that race cars such as NASCAR and Formula One are made of a carbon fiber/kevlar composite. When cars collide either with each other or an embankment of some kind, the cloud of dust as that section of car explodes is the carbon fiber whereas the shredded body parts still clinging on to each other are what's left -- the kevlar.
Also, there is more science to it than just lighten everything. If the body were straight-swapped metal for composite, the front/rear ratio of weight balance would be exaggerated. In other words, a mid-engined car like a 914 would not have too much of an effect; a rear-engined car like a Beetle/Super Beetle would be worse.
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