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Discussion Starter #1

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We're excited to announce our Engine Control Unit (ECU) Upgrades are now available for the Audi S4, S5, and SQ5 (B9/B9.5) 3.0 TFSI engine with the Bosch MG1 ECU! Expect massive gains with up to 431-480 HP and 467-549 FT-LBS of torque on tap, depending on octane, from this simple software upgrade. Additionally APR Plus is available with 431 HP and 467 FT-LBS and comes with a factory term limit matching limited powertrain warranty!

Our new suite of MG1 ECU software comes after months of extensive research and development that is typically absent from the aftermarket. Our upgrade makes the engine more powerful and more exciting. We’ve extensively calibrated the system to work flawlessly on the track, while retaining safety routines to protect your engine in the most demanding scenarios. This was all made possible by our engineering team's pursuit of perfection. Development vehicles were outfitted with additional sensors, including turbo shaft speed sensors, thermocouples, transducers, and more, along with our high speed direct RAM logging equipment, to feed valuable data to the team for analysis. After thousands of hours of testing and tuning we created new calibrations that are fine tuned for several octanes, including ethanol, and contain hundreds of map changes, with a vast array of safety features built in.

Features and Benefits:

  • Delivers up to 431-480 HP with 467-549 FT-LBS depending on octane
  • Max gains of +123 HP and +179 FT-LBS on E85
  • Supports 91 AKI, 93 AKI, 100 AKI, 104 AKI, and E60-E85 Ethanol fuel grades
  • Quicker acceleration
  • Speed limiter removed
  • Left-foot braking / brake boosting added
  • Auto Start/Stop defaulted to “off”
  • Properly rescaled boost gauge
  • Optimized thermal management and protection
  • No hardware required (Software only)
  • Supports standard bolt on modifications
  • Eliminated the need for a TCU upgrade to achieve full torque
  • Optional limited powertrain warranty
  • Free lifetime updates
  • 30 day money back guarantee

Power and Torque

397 HP / 395 FTLBS - Stock
431 HP / 467 FTLBS - APR Plus with a Limited Powertrain Warranty
431 HP / 467 FTLBS - APR Stage 1 91 AKI
441 HP / 483 FTLBS - APR Stage 1 93 AKI
450 HP / 509 FTLBS - APR Stage 1 100 AKI
458 HP / 537 FTLBS - APR Stage 1 104 AKI
480 HP / 549 FTLBS - APR Stage 1 E60-E85 Ethanol

APR Stage 1 91 AKI & APR Plus

APR Stage 1 93 AKI

APR Stage 1 100 AKI

APR Stage 1 104 AKI

APR Stage 1 E60-E85

Available Applications

  • Audi S4 (B9) 3.0T (North America and Rest of World)
  • Audi S4 (B9.5) 3.0T (North America)
  • Audi S5 (B9) 3.0T (North America and and Rest of World)
  • Audi S5 Sportback (B9) 3.0T (North America and and Rest of World)
  • Audi SQ5 (B9) 3.0T (North America)

Note: Other 3.0T Models to come!


  • 3.0 TFSI

Note: Excludes later European/ROW GPF models at this time


  • 8 Speed ZF8

Note: A TCU tune is NOT required for full torque delivery.


  • APR Plus
  • APR Stage 1

Note: Other stages to follow.


APR Plus

  • 91 AKI

APR Stage 1 (NAR)

  • 91 AKI
  • 93 AKI
  • 100 AKI
  • 104 AKI
  • E60-E85 Ethanol

APR Stage 1 (ROW)

  • 95 RON
  • 98 RON
  • 104 RON
  • 108 RON
  • E60-E85 Ethanol

Note: Always follow our fuel guide.


  • 8W0907559H S0005
  • 8W0907559H S0007
  • 8W0907559H S0008
  • 8W0907559M S0001
  • 80A907559C S0005
  • 80A907559C S0007
  • 80A907559C S0008
  • 80A907559J S0001

Note: If you have a 3.0 TFSI boxcode or revision not on the list, we can extract and unlock the ECU and make you aware of the next steps. This list will internally expand and the codes above are just the ones listed at the initial launch.

Hardware Requirements


  • $1,299.99 USD Retail (APR Stage 1)
  • $2,299.99 USD Retail (APR Plus with limited powertrain warranty)

Other Notes:

The factory intercooler is tiny. We highly recommend upgrading to the APR Intercooler System. Also, for this reason, dynoing on a dyno with an undersized fan will cause the ecu to dial back power to protect the engine. The ZF8 HP typically takes several dyno pulls to get up to temp and deliver proper power figures (stock and tuned). Lastly, in freezing weather E85 may require more cranks before starting.

How to Purchase

This ECU must first be unlocked before software can be installed either by APR or an APR Dealer.

If the ECU is locked, you have two options:

Option 1: Send us your ECU

Send us your ECU. We’ll unlock it, install APR software, and ship it back. The unlock process is free. Ground shipping to the continental USA is free. Follow these steps and watch the video for details on how to remove the ECU.

Step 1: Purchase the ECU Upgrade.

Step 2: Fill out this unlock form and select VW/Audi MG1 under unlock type.

Step 3: Mail your ECU to APR, 4800 U.S. Hwy 280 W, Opelika, AL 36801, USA, and include the last 6 of your VIN on the outside of the box.

Option 2: Visit an APR dealer

Visit an APR Dealer and purchase the APR ECU Upgrade. They will remove and mail the ECU to APR. We'll unlock the ECU, ship it back. They'll reinstall the ECU, and install the software.

Please note

At no time during the unlocking process is the ECU opened or physically modified. If the ECU is flashed back to stock, it will need to be unlocked again. If the ECU currently has APR software, and there is an update, a new stage, new feature, or you want to switch octanes, software can be installed by an APR Dealer. Also, vehicle manufacturers issue many ECU part numbers and revisions throughout their vehicle lineup. As such, some ECUs may be temporarily unavailable as new parts and/or revisions are released. If the vehicle’s ECU part number and revision is known, availability can be checked at any APR Dealer or by contacting APR.

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20,766 Posts
Discussion Starter #2

If you're eyeing up the new 3.0 TFSI ECU Upgrade, and are wondering what you should do next to get even more power, take a look at the APR intercooler system. You'll easily pick up a over 20 FTLBS of torque and over 15 HP. This is made possible by keeping your intake air temperature down so the ECU continues making the power requested, and more, for much longer, even the most demanding situations!

Get the details here:

ECU Upgrade: http://goapr.io/30b9
Intercooler: http://goapr.io/b930ic

20,766 Posts
Discussion Starter #4
Any plans for Stage 2 / Downpipe? Why does the B9 require sending in the ECU if it's not opened up?
We'll have stage 2, but we're not making a downpipe.

To flash most everything from about 2008 forward it has required some sort of exploit to get around a few checks the ECU does to see if the file on the ECU is signed by VAG as a factory file or not. On most everything we can deliver that exploit over the OBDII port. Sometimes ECUs need to be opened to deliver the exploit. On the B9 MG1 ECU the only method known for delivering the exploit is through the ECU harness. So, for the time being, the ECU needs to be sent in to be unlocked. We'll have these tools in our dealers hands in the near future.
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