Magnus Launch Control DeviceThe worst kept secret in Drag racing The Driver mod Drivetrain saver The slipper This is the ultimate in Diaphragm style clutch management. Weve all seen people who cannot get their car launched consistently, and then we watch videos of all these racers who are getting it done time after time. How do they do it? They are all running the Magnus launch control device. Everybody who has been racing long enough knows that dropping the clutch is a sure way