The throttle mate is the module to which the throttle cables attach to in the engine bay. It has a small wiring harness which goes to the ECM to control the throttle. The 06 (this is based on my discussions with PP and Skier's choice) is somewhat of a crossover in that the engine (Indmar) converted to DBW in 06, but Moomba didn't until 07. So there are still the throttle cables that go back to the motor, but connect to the DBW module (throttlemate) to control the throttle. I guess prior to 06, the cables attached to a totally mechanical throttle body assembly, and the 07's have the DBW module right at the throttle handle by the driver.