At a certain point with any car the weak link in handling becomes the chassis. No matter what size sway bars you have, what kind of strut brace, or how stiff your springs, your uni-body car has flex. By the time you consider a roll cage, your car is probably quite a bit faster than stock. This is yet another reason why at some point roll cages become necessary.
The above roll cage is made with .18 DOM tubing in 1.75 diameter, and meets or exceeds all SCCA specifications. For added looks it was powder coated with a titanium oxide powder coat.
The holes where the cage goes through the floor were neatly cut. Once everything was back in place the roll cage seems to just disappear into the interior. The car is much more quiet now on degraded roads. Pops and squeaks that were once emitted from the dash and chassis are gone. The car does exhibit slight harshness on rough roads though. To put it in perspective think about how much difference a 1 inch 4 foot sway bar makes. Now think about 55 feet of almost 2 inch tubing.
There is obvious added roll over protection with the cage in place. What is often over looked is the added side intrusion protection from the side cross bars. As with all cages, all bars within head reach should be heavily padded with SFI-45.1 certified padding.