Great looking set up. Will it fit the 2013 GT500? Do you have to keep the rear seat out after installation? Is drilling holes in the car sub-frame required (how is it mounted to the car)?
Our roll bar kits will fit the 2013 GT500, no problem. Yes, you need to keep the rear seat out after install. If you have a rear seat passenger, even a minor traffic accident could prove fatal. Not a good situation.
The main hoop bolts to new gusset plates that bolt-in in place of the (similar) OEM plates. Below you can see a pic of our gusset plates (production units are powdercoated in a wrinkle black finish), and our roll bar is bolted to these supplied gussets. It is extremely strong and NO cutting/drilling/welding is required. The rear tower brace is bolted in place. We ask the owner to drill (2) 5/16" holes per side to secure the tower brace. This, in addition to the shocks themselves bolting through the tower. This also contributes significantly to the rigidity of the car - and therefore performance. (You didn't think Rocketman's track video speed was because of skill did you?)

I also included a pic of the rear cross brace.
