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4 pt. is not a cage, it is a roll bar. Cage = 6-10 pts, depending on sanctioning body.
Charles and Dave -- I would advise you to hit a few races and check out the way ITA and ITS s13's have done their cages before you get started. There are now two IT s13's in the MARRS series (both of which will likely run at VIR this spring/summer). I'm not sure if there are any in the local regions near you (look up the website for your local SCCA and check out the results). Both are well built cars -- one often runs top 3 ITA and the other is a new creation from Joe McG (NASA instructor who drove green s14). Also, any pics of Bob Stretch's set up can only help.
Charles - if you are just putting it in for HPDEs, I would consider talking to a good shop about having them do a custom 4 point bar that could later be upgraded with the additional mounting points. If you are going to drive the car on the streets as well, you might as well be able to get in an out w/o crawling over door bars. Not to mention the reduced risk from not having all that metal near you inside. Having ridden in a fully caged s13, ingress and egress was not something I could stand on a daily basis.
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