EVC THROTTLE CONTROLLER FOR MERCEDES BENZ S63 AMG W221 M156.984 M157.980 TWIN TURBO 5.5L 6.2L V8Modern vehicles rely on 'fly by wire' throttle technology to measure pedal pressure & position to send signals to the engine's computer and convert it to acceleration. Many of these systems have a noticeable delay. EVC throttle controllers by iDrive (rebranded as Ultimate9) reduce this lag and improve response to make the acceleration feel more responsive. Key Features: Eliminates throttle lag. Increases throttle response. Improves overall