Super Comp is composed primarily of dragsters.
Engine, chassis and body modifications are virtually unlimited, though all entries must adhere to NHRA or IHRA safety standards.
Most Super Comp or Quick Rod cars are capable of running well under the 8.90 index, but they use a number of electronic aids, including a timer and an adjustable throttle (also known as a throttle stop), to run as close to the index as possible without breaking out.
At race tracks where the altitude is above 1,500 feet above sea level (mostly in Divisions 5, 6, and 7 in the NHRA), tracks will have an Altitude Correction Factor multiplied into the index time.
At The Strip at Las Vegas Motor Speedway, the index is 9.05 seconds.