according to NHRA rules the diagonal bars running off the main hoop need to tie into the subframe for going 9.99 and faster. Now the main hoop is going to come down right on the subframe, so how exactly am i supposed to pull this off. I was going to run the bars diagonaly below the rear crossbar to the tranny tunnel, but i doubt that the sheetmetal there would do much in a impact. Anyone have any ideas besides running a 2x2 bar from the rear sub frame to the front and welding the bars directly to that. BTW its a 14 point and i am making it a 1-off custom.

 

Most people just tie them into their subframe connectors, basically cut a hole in the floor where you want to tie them into the subframes, then weld them too the subframes then weld in sheet metal around the cage where it goes through the floor. It is easy to to because it can be done in the rear where the subframe connectors tie in by the a arm mounts, and then just run the the subframes straight up the rockers and tie in at the front throught the floor, then run a 90 over to the subframes in the front.