My 2014 Camaro is made from mostly steel and aluminum. Bumper covers are plastic, and some of the black exterior trim is plastic too, but the rest is all metal. They're actually very solid cars and they're quite safe in the event of a crash. Breakaway motor mounts, hooks that keep the hood from cutting your head off, airbags in the seats, etc.
When the dust settles, it may look like a crumpled tin can, but you'll likely walk away.
I still wouldn't want to crash at almost 200 mph in one though.
