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just my $wooden nickels worth but why do you think modern race cars have moved to monoque chassis instead of staying with ANY tubed chassis, round or otherwise.

I got my car, I'm happy so I don't really care anymore. ... where's that dead horse ... :D
A big part of that, both for race cars and for street cars, is safety. Tube chassis are strong and resist flexing, but they are a LOT harder to make effective crumple zones work in.

FFRs hold up well in front-end collisions because the structure of the front of the car is fairly weak and crumples right away. Thats good for safety, good for ease-of-repair, but bad in lower speed crashes that can buckle the frame more easily then they should (the "bumpers" wouldn't take a 5mph hit, I'd be willing to bet).
 
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