Twin Tuner Ii 07-21 Xl & 01-11 Tc W/ 36 Pin

The twin tuner ii has all of the features of the twin tuner and also allows retarding of the spark timing up to 10° to help prevent pre-ignition knocking.The user interface consists of up/down pushbuttons and a bright daylight readable led display to select and change the fuel trim and spark retard in the rpm and throttle position ranges required by most applications.