Electronic throttle controllers are an automobile technology which electronically bypass the car's computer to the accelerator pedal. These are especially effective on 4X4 vehicles that have a laggy throttle. With all the options available for throttle responsive, like on the iDRIVE, you can choose from an economy or performance setting. The iDRIVE has up to 18 settings. Many modern cars have 2 - 4 options.