AEM’s Dyno-Shaft Sportsman on-vehicle dynamometer system is literally a dyno on your car. It is as accurate as the most respected dynamometers in the industry. It provides real, accurate Horsepower and Torque numbers that are produced by measuring a vehicle’s Torque and RPM at the driveline, while you drive! The Dyno-Shaft Sportsman Series is designed for competitive amateur racers and serious performance enthusiasts whose applications can utilize a cast iron slip yoke. For higher stress applications, the Dyno-Shaft Pro Series kit features a CNC-machined Chrome Moly slip yoke.