I am looking at running in a few events this year that depending on my speeds I will need either a 6 point roll bar or a cage. One of the events I would need a “New for 2006 - Current NHRA certified roll cage equivalents are acceptable.” Can a cage be bolt in and be NHRA certified or would it have to be welded in? My cars are mainly street cars, so I would prefer not to do weld in cages.