On the flooring and firewall NHRA allows .024 steel or .032 alum. The weight of .024 (24 guage)steel is 1 lb per ft. 20gauge steel (.0360) is 1.5 lb per ft. .032 (20 guage) alum is .452 lb per ft. and .0403( 18 guage) alum is .569 lb per ft. John

8.72 @ 154.6 ,68 Charger 578ci 440-1s, 3000# w/drvr, 2150 den/alt NA