It's a tough call and I agree it depends on primary usage. When I converted my first Mustang from open track toy to full road race car, I put a full cage and Kirkey seat in it. I never drove it on the street again. My C5 Corvette had a six point cage in it with 5 point harnesses. I could not run the door bars in it and realistically still get in and out of the car in the garage and parking spaces. But I felt naked in the same C5 at the Texas Mile going 200 mph. I would never run an Optima-style event at a large speedway without a full cage. My current 69 Corvette street/track car project is getting a 4 point cage, Kirkey seat, harnesses, halon fire extinguisher. and a removable steering wheel so I can get out of the car over the side pipes.
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