The biggest difference between de Super classes and the ET bracketclasses is the tree. The Superclasses use a .400 pro tree (except for S/St .500) and the ET bracketclasses use the sportsman .500 tree. This has a huge effect on reaction times and most races are decided on reaction time.

In the ET-classes you qualifie on your self predicted indextime. You can decide (and change) your this indextime till just before the burnout, also in eliminations. Superclasses have the 10.9 - 9.9 en 8.9 sec index. Many competitors use delayboxes and throttlestops, which are prohibited in ET racing.