[COSDEVSVT]

I'm curious about this too ...

After a quick NASA cage rule review, the rear braces going down to the rear from the main hoop *might* be closer to the minimum 30-degree included angle between them and the main hoop according to some installed pics I've recently seen and comparing it to other Spec Foci pics.

Because of that minimum included angle, there doesn't appear to offer any rear shock tower stiffening benefit. The rear braces attach down low on the forward face of the rear wheel houses.

The upper drivers side bar that connects the main hoop to the front hoop looks kinda low too ... but most race cars are using a lowered seating position anyway.