drag slotHCS AMG - Bracket Buster 6 Ohm Pro-4 RTR Drag Race Slot Car . Viper V1 chassis; O-ring front axle set; Viper tweaked endbell, HCS AMG hangers, shoes, and springs; Pro-4 motor & traction magnets; Super Tough 821 gears, .250Drag slot cars are desned to go fast, and they’re not made to last. If you want your drag car to last, you’re going to have to build it yourself. Here’s how: Step 1: Buy a motor and controller.