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The ARC .550" blue restrictor plate is designed for the 196 Clone Box Stock for other classes, i.e., Predator 212 Box Stock; check with your track's rules for class structure and legality.
NKA Restrictor Plate Rules
40.4.36: Restrictor Plates
184.108.40.206: Modification of the restrictor plate is prohibited. The anodizing shall not be removed around the holes. The plate must be flat; holes must be as produced with no rounding of the edges. All holes must align perfectly with a stock ARC plate. If a restrictor plate is used, there must be a gasket on both sides.
220.127.116.11 Available restrictor plates, checked with blade type NO-GO gauge.
Blue: .550" Purple: .500" Green: .425" Red: .375"