Thanks guys! What if the car is say, a high 10 sec car, but the cage is required because the floor has been modified, or maybe the firewall has been modified? Would the cage need a tag then?

Also, what does the NHRA consider a "modified floor?" If subframe connectors are installed through the stock floor w/ 2x2 outriggers to the rockers (also through the floor) for the main hoop to land on, does that mean the floor is now modified, thus requiring a cage w/ sill bars?