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For 2005, NHRA has redefined the acceptable dimension for a roots-type supercharger for use in E.T., Advanced E.T., Comp (Altered and Pro Modified), Top Alcohol Dragster, Top Alcohol Funny Car, Funny Car, and Top Fuel.

The maximum size of an acceptable supercharger is a GM 14-71 with a 22 1/4-inch case length, 11 1/4-inch case width, and 19-inch rotor length. The maximum rotor diameter is 5.840 inches including the fixed stripping. The case must be one piece with a removable front and rear bearing end plates with the rotor required to be contained within the one-piece case.

For Top Fuel and Funny Car, the inlet and outlet cavity is restricted to a maximum one inch, measuring from the face of the bearing plate to the back of the cavity. Also, the maximum overdrive limit has been decreased to 1.50 for Top Fuel and Funny Car, while remaining at 1.70 for all categories that accept a roots-type supercharger.

Also, drivers in 9.99 to 7.50 front-engine, open-bodied cars or closed bodied without an OEM or steel firewall with nitrous oxide, supercharged, turbocharged, or any car with an automatic transmission in the driver compartment must have a jacket and pants meeting SFI Spec 3.2A/15, gloves and shoes or boots meeting SFI Spec 3.3/5.