D390 (formally D6381) motor upgrade for Club Car IQ and Precedent. Speeds up to 24 MPH and can be used with your existing controller. The IQ system identification symbol should be on the body of the cart or in the owners manual. Also, the IQ system has an electric "rocker arm" black forward and reverse switch that has a small capped computer port on the underside of the switch. The Regen system does not have this port. Please call if you have any questions.