The heart of each car is a 170hp Subaru EJ25 engine. The horizontally opposed four-cylinders have proven to be reliable and provide responsive power for the 2,800-pound cars. Power is fed to a Weddle four-speed synchromesh gearbox and out to axle stubs to the rear corners. Top speed in tour form is about 85 mph. Top speed is increased when the cars are configured with firmer suspension and prepped for racing with the engine unrestricted.