Integrated Engineering Performance ECU FlashWHAT DOES AN ECU TUNE DO? Your factory TSI 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 adders such as cold air intakes, intercoolers, donwpipes and turbo upgrades. IE's advanced ECU Tunes are