A glow engine uses a 2-cycle internal combustion engine to power gas-powered RC cars and adds realism with exhaust. Fuel is stored in the RC car's tank and filters in the fuel line may need changing. A 2-channel radio system is used to control the car remotely, with batteries powering both the controller and receiver in the car itself. Kits require assembly but allow customization, while RTR cars are pre-assembled but offer less customization options.