My Cart: 0 item(s)


Secure Checkout


N55 ECU Tune
Purchase N55 ECU Tune
  • SKU: N55-ECU-Tune

    N55 ECU Tune

  • Gains are at the engine or "crank". Actual gains are dependent on the model, model year, fuel octane, engine health, and environmental conditions. Learn More

  • $799.99

  • 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 424
Weistec Torque 407
Manufacturer Weistec
Street legal in all the US States No
Engine Family N55
Stock Horsepower 302
See more
year make model trim engine
2017 BMW X6 xDrive35i 8AT (F16) Turbo 3L I6 (N55)
2016 BMW X6 xDrive35i 8AT (F16) Turbo 3L I6 (N55)
2015 BMW X6 xDrive35i 8AT (F16) Turbo 3L I6 (N55)
2017 BMW X6 sDrive35i 8AT (F16) Turbo 3L I6 (N55)
2016 BMW X6 sDrive35i 8AT (F16) Turbo 3L I6 (N55)
2017 BMW X5 xDrive35i 8AT (F15) Turbo 3L I6 (N55)
See more
N55 ECU Calibration


The N55 vehicles are built very stout from the factory and respond beautifully to modifications.  While they have great performance right off the show room floor, it is just too hard to leave them untouched. 

The Weistec N55 Tune provides solid gains throughout the entire powerband, with gains of +60WHP* and close to 60WTQ* torque!  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".  This is best compared to that of the M4 GTS ???burble?? which comes from the factory with this in a mild form.  You can choose "Off" "Mild" or "Aggressive" for the "Burble".  Many seem to prefer ???mild??, but we gladly will let you choose based on your preference.

Please check with our compatibility list below to see if your vehicle can benefit from Weistec's ECU Calibration!


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.

  Weistec N55 ECU Power 

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

ECU Calibration Process: How do I get my ECU Calibrated?

Key Features:

  • Improved Throttle Response

  • Optimized Fuel, Spark, and Boost

  • 60 Wheel Horse Gains*

  • 60 Wheel Torque Gains*

  • "Burble" Options (for Race Vehicles only)

  • Cold Start (for Race Vehicles only)

  • Disabled Speed Limiter

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


Compatible Models / Chassis:

2009???2017 F10 / F11 / F07 535i
2010-2013 E90 / E91 / E92 / E93 335i
2010-2013 E82 / E88 135i
2010???2017 F25 X3 xDrive35i
2011-2013 E70 X5 xDrive 35i
2011???2015 F30 / F31 335i
2011???2014 E71 X6 xDrive 35i
2012???2015 E84 X1 xDrive35i
2013???2016 F32 / F33/F36 435i
2014???2018 F15 X5 xdrive 35i
2014???present F16 X6 xDrive35i
2014???2016 F26 X4 xDrive 35i

2011???2018 F06 / F12 / F13 640i
2012???2013 E82 / E88 135is[14]
2012???2015 F20 / F21 M135i
2012???2015 F01 740i / 740Li

2013???2016 F22/F23 M235i
2015???2016 F20/F21 M135i LCI

2015???2018 F26 X4 M40i
2016???2018 F87 M2

2013???2017 Alpina F30 B3 Bi-Turbo
2013???2017 Alpina F33/F34 B4 Bi-Turbo
2017???present Alpina F30/F31 B3 S Bi-Turbo
2017???present Alpina F32/F33 B4 S Bi-Turbo
2018???present Alpina F32/F33 B4 S Bi-Turbo Edition 99