NHRA spec only calls out SFI for 9.99 and quicker, HOWEVER--- IF you are running in a class with a 9.60 index, even tho your car will only do 10.20's you are still required to have the SFI cert. If you are just bracket racing and your dial is 10.20 you dont need a SFI cert-- BUT the chassie must still comply with the diagrams shown in the rule book for 7.50 and slower, just does not have to be certed with a sticker.