Ultimate9 - EVC Throttle Controller (EVC151)This throttle controller is suited for Audi S4 B7 (2002 2009) Why iDRIVE? Rather than a traditional accelerator cable, many modern vehicles use 'fly by wire' throttle technology. This system relies on a sensor that measures the pedal pressure and position and sends a signal to the vehicle's engine computer which converts to acceleration. Many of these fly by wire systems have a noticeable delay. iDRIVE allows you to tune the signal from the