Editing NHRA-legal roll bar (section)
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====Unibodies==== <blockquote> ''"Unibody cars with stock floor and firewall (wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x 0.125-inch (1/8") steel plates on top and bottom of floor bolted together with at least four 3/8-inch (0.375") diameter bolts and nuts, or weld main hoop (B bar) to rocker sill area with 0.125-inch (1/8") reinforcing plates, with plates welded completely."'' </blockquote> You can "sandwich" the floor of the car with these "plate pairs" bolted together, one on top of the floor and one underneath for each connection point and weld the bars to the top plates or you can use only one plate at each connection point and weld the plate to the floor or sill of the car, then weld your bar to the plate. This increases the square inch area of the installation and reduces loading on the floor so the bars will not punch through the floor sheet metal like they would if you just welded the bar straight to the floor or sill. When installing the B bar, you'll want to install it on each side as close to the door as possible, so that the driver will be "inside the box". This will probably require moving the B bar tubing up onto the sill of the car, at least partially. Bend up your 6 x 6 plate to weld it in, so that you are welding it partly to the sill and partly to the floor. '''Do not reduce the size of the plate to less than 6x6'''. You may have to grind the end of the B bars to make them conform to the curve of the plate at the sill and that's OK; you may have to heat and bend the plate to make it conform to the sill/floor and that's OK too, just do what you have to do to make it work according to the rules and you'll never have a problem at tech. Maybe you'll end up with part of the bar welded to the plate at the sill area and part of it welded to the plate at the floor, again, whatever it takes. Grind the end of the bar to make it work.
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