I also made a modification I've been meaning to make for a couple years now, and installed a roll bar:

That's a Hard Dog Sport bar, an actual ROLL bar and not those silly chrome hoops that the kiddies buy on ebay. This one has some strength to it. I hope I never have to find out how much strength it has, but it's nice to know it's there. It also does a good job of stiffening up the car a bit, takes away some shimmies and rattles over bumpy roads.