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BMW S55 ECU Tune
Purchase BMW S55 ECU Tune
  • SKU: 05-555-00067-3

    BMW S55 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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  • CARB EO: D-691-4
  • 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 546
Weistec Torque 675
CARB Exempt ID D-691-4
Manufacturer Weistec
Street legal in all the US States Yes
Engine Family S55
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2021 BMW M2 CS 6MT (F87) Twin Turbo 3L I6 (S55)
2020 BMW M2 CS 7AT (F87) Twin Turbo 3L I6 (S55)
2020 BMW M2 CS 6MT (F87) Twin Turbo 3L I6 (S55)
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Product Description

50 State Legal S55 ECU Calibration per EO # D-691-4. 

All 2020 models require bench flashing at this time.

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


The Weistec S55 tune provides solid gains through out the entire powerband, with signifigant peak to peak gains as well as large mid range gains!  This is on an otherwise 100% stock vehicle, including the air filters!

In addition to the performance gains, there are a couple options available for race vehicles.  First is the "Burble".  The M4 GTS comes from the factory with this in a mild form.  You can choose "Off" "Mild" or "Aggressive" for the "Burble".  Many seem to prefer aggressive, but we gladly will let you choose based on your preference.

The other race vehicle option would be Catalyst Heating.  On race vehicles, many times the catalysts are removed.  In those cases, there is no need for the catalyst heating which would just be making excessive noise on a cold start of the race vehicle.  If you have a race vehicle with the catalysts removed, Catalyst Heating can be disabled.


Cypher | Powered by Weistec

The Cypher is an optional upgrade when purchasing a Weistec tune for your Fxx series BMW. Simply navigate our website to the tune you wish to purchase. On the tune's product page there will be a drop-down menu giving the option to add Cypher to your tune order. From there, the order is processed, and a Cypher tool will be shipped to you

  • No need to send in your ECU / DME computer*
  • Swap tunes file or return the stock within minutes.
*2019 Models manufactured after April 2019 that have recently received a may not work with OBD2 flashing.  All 2020 models require bench flashing at this time

  Weistec S55 ECU Power 

What does all this mean to you?  More power, sharper throttle response, and consistent performance with out sacrificing refinement. 

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

Key Features:

  • Improved Throttle Response

  • Optimized Fuel, Spark, and Boost

  • M4 GTS "Burble" Mild and Aggressive Options (for Race Vehicles only)

  • Disabled Cold Start (for Race Vehicles only)

  • Disabled Speed Limiter

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

Tuning Process: Cypher Handheld Tuner