Mine is all c.m. 25.5/7.50 cert. The Tech officials compliment my car every time they recert it. Get a NHRA tech book. Some of the current changes NHRA has made is the funny car cage bars has to be parallel on both sides of driver. Many like to move the outer bar back some to ease getting in and out, no longer legal. Also, the diagonal roof bars have to land 6" from the corner.