RennTech Performance ECU Upgrade For Mercedes-Benz W166 ML 63 AMG BiTurbo

VENDOR: RennTech

SKU: 54.166.ML63BI

All orders will include an AutoTalent window decal


RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal. RennTech proprietary tuning module stores both the RennTech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be reflashed at any time as many times as you wish.

RennTech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s. RennTech experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RennTech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes.

All RennTech HSMs are adjustable via USB using either Windows or Android OS.The software allows the user to adjust the ride-height at each corner in 1mm increments independently. The software also has three locations where the user can store pre-configured suspension setups for quick changes.


We have found the M157 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see higher baseline numbers than claimed by the factory.

Power gains are calculated based on stock numbers measured by RENNtech.

Crank Performance Numbers are calculated with an 18% Drivetrain loss on SUVs.

Our numbers will be dependent on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Upgrade.

States known for poor fuel quality have to be supplied with a lower power setup


  • Gains: +64HP & +72LB-FT
  • Long-lasting and driver reliability
  • Significant gains in horsepower
  • Increases the performance
  • Significant gains torque 
  • Increasing the engine's rev limiter
  • Incredible performance gains

Stock Performance:

  • 550 HP @ 5,500rpm; 560 LB-FT @ 2,000-4,500rpm
  • 574 HP @ 5,500rpm; 623 LB-FT @2,800-3,900rpm

Modified Performance:

  • 638 HP @ 5,500rpm; 695 LB-FT @ 3,700rpm
  • 523 awhp @ 5,500rpm; 570 awtq @ 3,700rpm

      Vehicle Fitment:    

      • 2013 Mercedes-Benz W166 ML 63 AMG BiTurbo
      • 2014 Mercedes-Benz W166 ML 63 AMG BiTurbo
      • 2015 Mercedes-Benz W166 ML 63 AMG BiTurbo


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