Watch 2021 NMCA Muscle Car Mayhem live on FloRacing! The NMCA Muscle Car Nationals Series opens its season with Whipple Superchargers NMCA Muscle Car Mayhem presented by Holbrook Racing Engines, scheduled to take place at Bradenton Motorsports Park in Bradenton, Florida. As this is the first race of the season, the Northern-based competitors are chomping at the bit to feel some warm weather and get the racing season started. This event will feature one of the season’s largest turnouts in the NMCA’s championship categories, plus a large contingent of True Street, Modern Hemi, LS/LT, and bracket racers.