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  • N55 306ps 91AKI/95RON
  • Stock US Spec M235i 91AKI/95RON
  • Image 3

N55 (F) E-Flash Stage 1 ECU Performance Software


Product Description

ESS N55 F series E-Flash Stage 1 ECU software is a result of extensive testing and exact calibration of ECU parameters to allow significant performance gains on a stock or lightly modified car (intake/exhaust/IC). The Stage 1 software is developed and tested in extreme heat in the Arizona desert as well as extreme cold temperatures in Scandinavia. Typical gains are in the 40-45whp range.

The E-Flash N55 software is a full OBD2 solution that does not require sending in the ECU or opening the ECU in any way.

Catless of HFC option is not available for customers in California.



Part number: 101-103
Top Speed Governor: Removed
RPM Limit: 7100RPM
Fuel requirement: 91-93US/ 98Euro
Horsepower 2012: 360 DIN (Stock 306/320)
Horsepower 2013+: 400 DIN (Stock 306/320)
Torque: 500NM (Stock 400NM)



*Correction factor for drivetrain loss is 15% above RWHP as seen in dynograph (RWHP/0.85) Power rating is dependent on fuel quality.

Application intended for: All 135i,M135i,M235i,335i,435i,535i,640i,X3 3.5i, X5 3.5i N55 from 2012 2013 2014 2015 2016

Product Reviews

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  1. Woke my 15 X5 5 Star Review

    Posted by on Jun 21st 2018

    I have a 2015 X5 i35 sDrive and wanted a little more out of it since it was stock. I ordered this Stage 1 ECU flash and it is a noticeable difference in performance. I have since add a Burger Motorsports CAI and throttle response is instant now. Customer service is top notch as well.

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