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.