The best argument for the side diagonals is when you slide under another car, under-thru a guardrail, or a large object hits you straight on.

I think I have the only full halo 818R, and yes it is modeled after the Lotus 2-11 FIA GT4 design. If I were doing mine again I would add a bit more rearward rake to the front hoop. Otherwise I'm happy with it. Smaller drivers go in under the halo, I just jump up on it, swing my legs inside, and drop in.

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