APR ECU Upgrade – 2.9T EA839 V6 (B9) (RS4/RS5)

Unlock hidden horsepower and torque with our performance tuning software for your vehicle’s Engine Control Unit (ECU).

Stage 1: $1340.00*

*Price includes labour for install.

Contact us for purchasing & install appointment.

SKU ECU-29T-EA839-B9 Categories , Tags ,


APR ECU Upgrade – 2.9T EA839 V6 (B9) (RS4/RS5)

APR’s ECU Upgrades are the best dollar-per-horsepower modification one can make to improve engine performance. 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 ECU Upgrades are available with various features and supported octane levels and each stage is compatible with most typical bolt-on modifications. The software is installed to the vehicle’s factory ECU through the OBD-II port once the ECU is unlocked, resulting in a clean and headache-free install. Furthermore, for those looking for tuning with a limited powertrain warranty, APR Plus has you covered!


  • Horsepower – More horsepower throughout the whole rpm band
  • Torque – More torque throughout the whole rpm band
  • Warranty – APR Plus is available, providing a factory term limit matching limited powertrain warranty
  • Stages – Multiple performance levels depending on installed hardware
  • Fuel Grades – Multiple octanes from which to choose
  • Ethanol – Ethanol support from E60-E85 for maximum performance
  • Acceleration – Accelerate faster with more power and reduced throttle lag
  • Linear Throttle – Pedal maps adjusted for a more linear feel
  • Brake Boosting – Left foot braking or brake boosting added
  • Rev Limiter – Increased redline for higher revving
  • Standing Limiter – Increased standing limiter for higher revving at idle
  • Speed Limiter – Go as fast as you want with the speed limiter out of the way
  • Auto Start/Stop Inversion – Auto Start/Stop defaults to the off position
  • Exhaust Flaps – Enhanced power delivery and drivability through recalibrated exhaust flap actuation
  • Added Safety – Additional safety features and protection modes added
  • Economy – While cruising, or driving normally, your fuel economy may benefit from our optimized calibration
  • Boost Gauge – The factory boost gauge displays accurate boost and reacts more quickly
  • Power and Torque Gauges – The factory power and torque gauges are accurately rescaled
  • Direct Port Programming – Clean and easy install to the factory ECU without opening the case
  • Free Updates – Get free updates for life
  • Guarantee – 30 day money back guarantee

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Year Make Model Engine
Year Make Model Engine
2018 - 2021 Audi RS4
2018 - 2021 Audi RS5 2.9L

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