My car will be driven on the street but primarily track day and maybe show if ever gets that nice........also a gaol of running silver state. So for Me I'm not following any given set of rules. I did follow SCCA's diameter/per vehicle weight rule so the bar is 1.75" .120 DOM. I'm doing basically a full cage tying into front and rear suspension for full chassis rigidity. No back seat so no worries. Inside the car the bars will be as close to body as possible running along A-pillars and through dash with front cross bar at fire wall. For the doors I was planning on something very similar to the Syclone above. That to Me seems to be the only way to get the benefits of a bar there while lower the PITA factor when getting in and out. My vehicle will have a braced race type seat (haven't decided tilt back or no tilt yet) but will be mounted as low as possible for head to bar clearance and have at least a 4 point harness. If You've noticed most Touring car race cars the drivers head just sticks up over the door. So I believe seat height is just as an importaint part of the cage discussion as anything.
Just orderd the tubing this week so I'll post some pics once We get going on that.
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Dan 
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