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M157 ECU Tune
Purchase M157 ECU Tune
  • SKU: 01-157-00252-3

    M157 ECU Tune

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More about Crank HP Vs Wheel HP

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

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  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 715
Weistec Torque 777
CARB Exempt ID D-691-1
Manufacturer Weistec
Street legal in all the US States Yes
Engine Family M157
See more
year make model trim engine
2015 Mercedes-Benz G63 AMG 6x6 6x6 (W463) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz G63 AMG 6x6 6x6 (W463) Twin Turbo 5.5L V8 (M157)
2019 Mercedes-Benz GLE63 AMG Base (W166) Twin Turbo 5.5L V8 (M157)
2019 Mercedes-Benz GLE63 AMG Coupe (C292) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz GLE63 AMG Base (W166) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz GLE63 AMG Coupe (C292) Twin Turbo 5.5L V8 (M157)
See more

Product Description

All 2020 models require bench flashing at this time.

ECU Tuning Process:How do I get my ECU tuned?

As the global leader in Mercedes Benz AMG Tuning, Weistec Engineering sets the performance standard for bi-turbo M157 performance calibration. Designed in-house by our expert tuning staff, our M157 ECU tune has surpassed the 600 wheel horsepower mark on a completely stock vehicle with no other modifications. This tune is also 100% street legal!

CARB EO# D-691-1

With a keen understanding for optimal running conditions for the M157, we have revised many features of the factory ECU programming which creates an astounding crank horsepower and torque increases on California pump 91 octane fuel all while being street legal.

The tune can be installed by an authorized Cypher Pro Dealer or simply shipping the ECU to our Southern California Facility.

Key Features:

  • Increased Wheel Horsepower

  • Increased Wheel Torque

  • Eliminate Top Speed Limiter

  • Improved Throttle Response

  • Optimized Boost, Fuel and Spark

  • CARB Legal

  • All OBD Monitors Function as Stock

*Power gains vary based on model, modifications, fuel, and running conditions.

Tuning Process: Cypher Handheld Tuner