Performance ECU firmware for the 2015 Audi RSQ3 with the 2.5 TFSI CZGA engine. This package includes two Stage 2 variations calibrated for Bosch MED17.1.1 with software version 003874 and ECU ID 8U0907404B — a balanced daily Stage 2 and a harder, high-response variant. Ideal for vehicles with downpipe, intake and DSG7 performance TCU tune. Developed on dyno and road-tested to ensure consistent delivery across all gears.