APR ECU Upgrade - 2.5 TDI

Fits 2.5 TDI engines found in various ROW market vehicles

Part # ECU-25D Be the first to write a review

APR ECU Upgrade - 2.5 TDI

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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 is compatible with most typical bolt-on modifications. The software is installed to the vehicle's factory ECU through the OBD-II port, resulting in a clean and headache-free install.


  • Horsepower - More horsepower throughout the whole rpm band
  • Torque - More torque throughout the whole rpm band
  • Acceleration - Accelerate faster with more power and reduced throttle lag
  • Brake Boosting - Left foot braking or brake boosting added
  • Speed Limiter - Go as fast as you want with the speed limiter out of the way
  • Economy - While cruising, or driving normally, your fuel economy may benefit from our optimized calibration
  • Flash Counter - Flash counter does not increase with each flash
  • Direct Port Programming - Clean and easy install through the OBD II port without removing the ECU
  • Free Updates - Get free updates for life
  • Guarantee - 30 day money back guarantee
Brand APR
Engine AspirationTurbocharged
Engine ConfigurationI5
Engine Displacement2.5L
Engine FamilyEA135
Engine OrientationLongitudinal
Fuel TypeDiesel
Product TypeECU Upgrade
Part NumberECU-25D
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    APR Stage 1

    The APR Stage 1 ECU Upgrade is the first step towards making more power and torque! This simple upgrade requires no engine hardware modifications, and produces excellent leaps in horsepower and torque making the vehicle exceptionally quicker in all scenarios. Available for 2.5L TDI, and Common Rail (CR) 5 cylinder engines. We may still have software! Visit an APR dealer for more details.

    APR Calibration Report

    130-200 HP 184-294 FT-LBS130-200 HP220-345 FT-LBS+21-32 HP +36-55 FT-LBS
    Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more.

    The APR Difference

    Who we are - We’re a global automotive engineering firm nestled in Opelika, Alabama. Our 80,000ft² state-of-the-art facility is home to some of the best engineers in the industry, who have mastered hundreds of engine management systems. We have multiple engine and chassis dynos, and the resources necessary to create our ECU Upgrades in-house, from the ground up! We're not a new company either. We've been around since the 90's and we have a strong financial backing to ensure we'll be here to support you for decades to come!

    What we do - We optimize everything to make your engine more powerful. We adjust air-fuel ratios, advance ignition, increase boost pressure, alter cam positions and lift profiles, and more, all depending on the type of engine and management system, of course! We don’t take shortcuts, and we don’t take risks. We do it the right way.

    How we differ - With our proprietary calibration and direct ram access data logging tools and operating system code changes, we’re able to make some of the strongest and fastest ECU upgrades, without needing costly end user adjustments. We work with the ECUs intelligent modeling and closed-loop systems, and beta test in multiple environments to create upgrades that work no matter where you drive!

    APR Software Pricing Guide

    Our performance software upgrade is available in multiple stages with optional features.

    APR Stage 1
    APR Stage 1 ECU Upgrade$399.95

    Purchasing, Guarantee, and Updates

    Purchasing Options¹: Locate an APR Dealer. They will physically install software on your vehicle at their location. Alternatively with the APR Remote Tuning Service (RTS) you'll purchase an APR Tuning Cable and we, or a participating dealer, will remotely install software on your vehicle†.

    Money-Back Guarantee: Try our Software Upgrades for up to 30 days, risk free! If you are not satisfied, have it removed and refunded.²

    Free Updates: If we make an update, add a standard feature, or if the manufacturer issues an update, you are entitled to a free update.³

    1. Availability: APR Software may not be available for all vehicles. Stages, programs, and features may not be available for all ECUs.
    2. Money Back Guarantee: Excludes some Software Upgrades, such as those included with a hardware purchase. Labor charges are at the discretion of the installer.
    3. Free updates: Subject to availability. Labor charges are at the discretion of the installer. Applicable to the original purchaser. Second hand owners may inquire with an APR Dealer about a software license transfer fee.
    †. Remote flashing: Excludes APR Plus. Excludes some platforms. Dealer participation will vary. Visit our product page for details.

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      Some parts are not legal for use in California or other states with similar regulations.