I beleive 9.99 and quicker is the NHRA cage requirement. 10.00 and slower with a stock floorboard (except for rear wheel tubs)and firewall is the roll bar rule. Call NHRA tech to make sure NHRA did lower the ET for roll bars several years ago from 11.99 and quicker to 11.49 and quicker

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)