I know the roof material for the 451 pasion is Bayer polycarbonate.
Bayer MaterialScience NAFTA - News
Was this a change from the 450's?
The reason I ask is in the all to famous video of the 450 in a 70 mph crash into the concrete they show the roof crumbling into a bunch of small pieces.
But in many of the reports of crashes here in the states with roll overs the roof apears to stay intact.
Was the old roof made of some other material?