TCI Paddle Shifters are designed for use with any 4 or 5-speed automatic transmission that is controlled by a Transmission Control Unit (TCU). Wireless CAN signal communication between the paddle shifter and TCU is immediate without any signal interference, lag time or disruption. These steering wheel mounted .5-inch thick paddle shifters instantly instruct the transmission which gear you are choosing. Engineered to fit all 5 and 6-bolt aftermarket steering wheels, these paddle shifters contain several varying width spacers so you can adjust the location of the steering wheel. A horn button relay is used to power the TCI Paddle Shifter System. The shifting performance of these paddle shifters is ideal for track or highway use.