This Stage 1 ECU remap is tailored for the 1999 Audi TT 1.8T 20V with Bosch ME7.5 ECU, software version 354178 / 0001. Designed to increase responsiveness and midrange torque, this file unleashes the full potential of the factory K04 setup with recalibrated boost, timing and fueling strategies. A reliable and dyno-tested upgrade for daily driving or spirited road use.