An estimated 22 new AMXs were modified by Thoroughbred Motors in Denver, Colorado for select AMC dealerships to have ready-made racers for both the dragstrips and road courses nearby.[50][51][52] They were named "Von Piranha" and the changes included the addition of two sets of air scoops on each C-pillar with ducts to cool the rear brakes and on the roof above the windshield that was reportedly functional to cool the cockpit on race-bred versions.