Posted By: nmrasalesdept Mar 12, 2021 Today, the NMCA Tech Committee updated the Xtreme Street class rules with the addition of V-6 turbo combinations. The 2021 NMCA class rules can be found here: https://www.nmcadigital.com/2021-class-rules-payouts/ Buick Turbo V6 , Edelbrock Xtreme Street , NMCA Rules Updates , Turbo V-6 , Rules Adjustments , Ultra Street