I'm going to be building a 8.5 cage for my drag car. The NHRA rule book doesn't state anything about spec on the 4130 tubing. I've purchased some Cold Drawn 4130N tubing from the local tubing supplier. Recently I've been reading about MIL spec tubing being required by SFI for chassis cars. Is it required on an 8.5 cage?

Regards,
Justin