APR - ECU Upgrade for the Audi B9 S4, S5, SQ5 3.0T

In Stock
You may set up an appointment to have this software installed at one of our shops or install it yourself via the APR Ultralink. If you are planning on installing this software yourself via the APR Ultralink, simply purchase your Ultralink here. You will be prompted to purchase the software for your vehicle in APR's Ultralink store.

We're excited to announce APR's Engine Control Unit (ECU) Upgrades are now available for the Audi S4, S5, and SQ5 3.0T EA829 engine with the Bosch MG1 ECU! Expect massive gains with up to 411-491 HP with 551-629 FT-LBS of torque on tap, depending on octane, from this simple software upgrade.

Please note that your vehicle must be present at one of our shops in order to install this software. Please contact us for more information or to set up an appointment.


  • Delivers up to 411 HP with 551 FT-LBS (APR Plus)
  • Delivers up to 411-491 HP with 551-629 FT-LBS depending on octane (APR Stage 1)
  • Max gains of +103 AWHP and +190 AWFT-LBS (APR Plus)
  • Max gains of +103-171 AWHP and +190-249 AWFT-LBS depending on octane
  • Supports 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 fuel grades (APR Stage 1)
  • Optional factory term limit matching limited powertrain warranty with APR Plus
  • Standing RPM soft limiter increased
  • Left-foot braking / brake boosting added
  • Properly rescaled performance gauges
  • Optimized launch control strategy for faster response and boost building
  • Optimized driveline protection during launch
  • Optimized thermal management and additional protection
  • Optimized exhaust crackle temperature safeties
  • Optimized high-gear LSPI protection and turbocharger protection added
  • Optimized the factory volumetric efficiency low end torque fluctuation
  • Speed limiter removed
  • Increased rev limiter for use with TCU upgrades
  • Exhaust flaps recalibrated to provide better performance and increase sound during free-rev
  • Auto start-stop defaults to the off position
  • No hardware required (Software only)
  • Supports standard bolt on modifications to further increase outpu
  • Eliminated the need for a TCU upgrade to achieve full torque
  • Free lifetime updates
  • Direct OBDII port flash (No ECU removal)
  • 30 day money back guarantee

DirectPort Programming is now available for this ECU! This means that your vehicle can be tuned in as little as an hour at one of our shops.

ECU Stages

APR Plus ECU Upgrade with a Limited Powertrain Warranty
The APR Plus ECU Upgrade is the first step towards making more power, and it includes our limited powertrain warranty. This simple upgrade requires no engine hardware modifications, and produces 411 HP with 551 FT-LBS of torque. Gains as high as 103 HP and 190 FT-LBS of torque are available throughout the power band, making the vehicle exceptionally quicker in all scenarios.

The APR Plus ECU Upgrade matches the performance of their Stage 1 ECU Upgrade (91 octane). To get even more power, you can add any of our other Stage 1 compatible products and still be covered under the APR Plus warranty! To learn more about APR Plus, please visit the APR Plus website.

If you're not interested in the APR Plus limited powertrain warranty, and want even more power, check out APR's other Stages.

APR Stage I ECU Upgrade
The APR Stage I ECU Upgrade is the first step towards making more power! This simple upgrade requires no engine hardware modifications, and produces 411-491 HP with 551-629 FT-LBS of torque depending on fuel grade. Gains as high as 103-171 HP and 190-249 FT-LBS of torque are available throughout the power band, depending on fuel grade and factory output, making the vehicle exceptionally quicker in all scenarios.

APR Stage 1 is available for 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 fuel grades in North America, and 95 RON, 98 RON, 104 RON, 108 RON, and E60-E85 in the Rest of the World.

Please note, APR's E85 software is not a full flex fuel program. In this mode the engine is only designed to work on E85, as found directly at the pump, including both summer and winter blends from E60-E85. Using traditional pump fuels in this mode may result in engine damage. Do not manually blend with traditional pump fuel or race fuels or use race specific barrels of E85. To ensure proper E85 content levels, APR recommends using an E85 content sensor. Before using Ethanol, educate yourself and follow their switching guide.


APR ECU Upgrade Included Features

APR World Class Calibration Expertise

Tuning 101:
The 3.0T engine uses a Bosch MG1 ECU for engine management. Basically, it’s a computer that tells the engine how to operate. Tuning software, like the APR ECU Upgrade, tells the engine how to make more power. It does this by running more boost pressure, optimizing the cam shaft positions, valve lift actuation, adjusting the air/fuel ratio, advancing ignition timing, and more.

A Better Engine Management System:
The 3.0T’s ECU is incredible. Without the driver knowing otherwise, the ECU makes intelligent adjustments to the engine’s operations to keep it running smoothly. Unlike ECUs found in many other makes and models, when properly tuned, the ECU eliminates the need for custom tuning to maximize output, even when weather conditions change dramatically.

How APR Differs from the Competition:
The ECU is powerful, but extremely difficult to master. Without mastery, the ECU must be simplified, removing what makes it so desirable. The result is an incomplete product that often requires end user adjustment to maximize output in limited scenarios. On the contrary, APR’s Engineers spent years mastering the ECU to unlock its full potential. With complete access to the thousands of maps, tables and variables within, as well as a high-level understanding of how it works, APR’s Engineers were able to take advantage of everything the ECU has to offer. Power is maximized in nearly all scenarios, eliminating the need for end user adjustments. High performance operational modes are enabled and calibrated to deliver smooth daily driving, with a snappy and responsive throttle during moments of spirited driving. Mastery of the boost control system makes for an impressively predictable driving experience as the turbo spools quickly, delivering instant power, while torque-by-gear helps with traction control and protects the engine from being lugged out in tall gears. Lastly advanced high-output protection routines are enabled, allowing the ECU to make constant adjustments to airflow and fuel to cool and protect the engine, all without the driver knowing otherwise.

Auto Start Stop OFF:
We've defaulted the Auto Start Stop system to the off position. Just click the button to turn it on!

Acceleration Enhancements:
Beyond horsepower and torque enhancements, APR’s Calibration Engineers were able to increase the acceleration rate of the vehicle through other calibrations changes. Ignition delay is reduced resulting in a more responsive pedal without altering overall throttle sensitivity. Furthermore, throttle lag commonly noticed at slow speeds and while reapplying throttle has been reduced.

Speed Limiter:
APR’s ECU upgrade increases the vehicle's top speed limiter for blistering sprints around the track or across the Autobahn without the speed limiter shutting down the fun.

Left Foot Braking:
APR's Left Foot Braking feature allows more control over the vehicle’s throttle. The factory equipped vehicle's throttle input is disabled while pressing the accelerator and brake at the same time. Left Foot Braking, a common motorsport driving technique, allows the driver complete control over the vehicle’s throttle and braking system, which may give the vehicle the edge it needs at the track.

Increased Fuel Economy:
APR’s Calibration Engineers paid close attention to several parameters directly related to fuel economy, especially while cruising at highway speeds. Depending on driving style and fuel quality, better miles per gallon may be achieved.


  • 2018+ Audi B9 S4 3.0T
  • 2018+ Audi B9 S5 3.0T
  • 2018+ Audi B9 SQ5 3.0T
Read More
Read Less

Your cart