Based on performance numbers from the 2018 School of Automotive Machinists & Technology NHRA Factory Stock Showdown Series, the NHRA Technical Department is increasing the minimum weight on all Dodge Challenger Drag Paks from 3,550 pounds to 3,575 pounds. All Chevrolet Camaro COPOs and Ford Mustang Cobra Jets with Whipple superchargers will have a reduction in minimum weight from 3,550 to 3,525 pounds. Ford Cobra Jets with 2.3 Eaton superchargers will have a reduction in minimum weight from 3,300 to 3,275.  This rule change will go into effect immediately for the 2018 AAA Insurance NHRA Midwest Nationals.