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Bolt-ins that are designed specifically for a certain car are only moderately difficult. If that is not what you have it will probably be a royal pain to fit. Much easier if the car is cabriolet.
Full cage or just a roll bar. Ther are several options for each out there. I had the Autopower bolt in, which a fairly popular roll cage. I have since had a custom built one. It adds a lot of stiffness to the car and makes it much more drive able.
"Bolt in" roll cage in my 993. You bolt it in but only after you have two tubing receptacles welded to the door sills, 2 on either side. The Heigo cage is very well built with the added benefit that it stiffens up the car reducing body flex, keeping the suspension working optimally, or so they say.
The welded in cages are going to be optimal, but you won't have much of a car interior left....but with the welded in cages you get more cross bracing and NASCAR door protection. Of course the NASCAR door protection only works well when the driver door has been gutted.
Get a cage, great peace of mind! And you'll look fast!!!
If you go with a roll bar instead of a cage check the angles of the shoulder belts. You may need a harness bar as well. I just put both in my Cayman S. Don't know if PCA CR has specs but you can always look up the SCCA GCR (General Competition Rules) on line and look at the diagrams. A sanctioning body has already done the thinking for you.
Really though, first see if you like tracking a 944 enough to want to sink money into it. I have to imagine that it is less expensive to get one already built for the track. Get a good local P-car track prep mechanic and work with them. A keeper will be concerned for your safety, goals and pocketbook.
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