Integrated Engineering Performance ECU FlashRequires Integrated Engineering POWERLink OBDII Dongle (IESOVU7). Select option to add if required. WHAT DOES AN ECU TUNE DO? Your factory Audi 2. 0T power plant is controlled by a very advanced Engine Control Unit (ECU). This complicated computer is loaded with maps and routines to operate your vehicle efficiently, however, much of the available performance is left on the table and the calibration is not written to take advantage of aftermarket power