o i am getting ready to do my cage i was reading the ndra rulle book last night so do comp4 cars have to have a cage or can they get away with a bar and also what are the specs on the tubbing ie.. material thickness kind of weld i know it has to be mounted with 6x6 plates and bolted or welded to the rocker panel also if i can get away with just a bar how many points do i need thanks keith

 

http://www.nhrasportcompact.co...s.pdf

section 4.10

1 3/4 .118 mild steel (Mig or Tig) or .083 chrome moly (Tig)

You only need 5 points.

Main hoop w/ cross bar (sholder bar)
2 back bars
Drivers side door bar

 

My wifes car has a 10pt cage for comp4. It used to be a turbo4 car is the reason.