Based on the FLEXJET NHRA Factory Stock Showdown performance numbers from the 2026 season, the NHRA Technical Department is increasing the supercharger overdrive by changing the upper supercharger pulley for the 2026 Dodge Charger 354 Gen-5 Whipple from 3.750 inches to 3.625 inches. This rule change will go into effect immediately. NHRA reserves the right in the future to make additional rule changes to control performance and maintain parity in the category.