Bolt in rollbars Q & A

On unibody cars with stock floor and firewall (wheel
tubs permitted), the roll cage may be bolted or welded to the
floor/rocker box via 6-inch x 6-inch x .125-inch steel plates similar to
the roll-bar attachment requirements of paragraph 4:10 in this section.

You can bolt it to the floor with plates on both sides of the floor..everything else is going to need to be welded.

[ame]http://www.nhra.com/UserFiles/file/General_Regulations.pdf[/ame]

Look on page 22...under Full bodied cars