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an exo does almost nothing for support in a roll, just for looks.
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Just for looks my ass! A properly designed exo can do alot more than just look like a jungle gym. First of all the point of an exo cage is to protect the body, that is it's primary goal. If you want good roll protection then you either need to cut through the roof and run an X brace behind the front seats for some triangulation or do a seperate inner cage and tie the two together. If you don't care about the body then just do the inner.