Quote Originally Posted by aozora View Post
Cusco as stated, is not accepted under any racing regulatory body that I know of, simply because the piping diameter is too small, the bends in the structure, use of bolts on removeable piping etc.
This is correct, only certain tubing dimensions and bolt types are allowed. One point in particular, CAMS regulations stipulate that only one bend is allowed in the front roll bar. If you look at the Cusco cages often found in S2000s, there are two. This weakens the structure of the bar, making it more prone to collapse during a roll-over.



Quote Originally Posted by aozora View Post
But as far as I know, "removeable" diagonal braces and harness mounts are not permitted through CAMS
The diagonals are actually allowed to be removable, but they need to be installed during competition.

I agree that having a roll bar or half cage provides an extra level of protection, even for the street. Except if it's designed like most of the Cusco cages of course. But yes, good for bling though!