The NMRA Technical Department address’s safety concerns in NMRA VP Racing Fuels Street Outlaw regarding turbocharger modifications. The Technical Committee reminds competitors that compressor and turbine wheels, blades, hubs, cover, or housing modifications are PROHIBITED and must be run as-produced. Recent incidents have revealed modifications to original designs that could become a safety hazard.
The ProCharger Modified Street category will now include the 2019 Cobra Jet supercharger combination at 3,500 pounds and require a specific set of supercharger/crankshaft pulley dimensions.
These adjustments are listed in the respective class rules and 2019 Rule Adjustments links on the NMRA Rules Page at: