The APR ECU Upgrade for the new RS3 and TTRS is here! Expect up to 542 HP and 500 FT-LBS with our Stage 1 ECU! Features such as E85 support and Full EMCS Program Switching are available today with multiple stages on the way. Lastly, we even offer a Limited Powertrain Warranty with our APR Plus ECU Upgrade. Click the image for more info!

APR is pleased to present the ultimate engine control unit (ECU) upgrade for the 2.5T EA855 EVO (Gen 2) engine!

APR’s ECU Upgrades are the best dollar-per-horsepower modification one can make to the 2.5T engine. The upgrades dramatically increase horsepower and torque, making for an exceptionally quicker and more exciting vehicle. This is made possible through APR’s optimization of the factory engine management system to take full advantage of the engine’s capabilities, without needing any end user adjustment. The software loads to the factory ECU through the OBD-II port, resulting in a clean and headache-free install. Optional features, such as APR's EMCS Program Switching and APR Mobile are available. Furthermore, for those looking for tuning with a limited powertrain warranty, APR Plus has you covered!