Dinan Stage 4 Performance Engine Software - 2011-2013 BMW 550i


PART# D903-44T54

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Stage 4 Engine Software is for use with the High Flow Intake/Strut Brace, ensuring optimum performance and drivability. Get the most out of your performance upgrades from the combination of the Performance Software and your Dinan parts upgrades. Software upgrades are specifically designed and tuned for the Dinan upgrade. This tuning is especially noticeable in the first two gears, now catapulting the car off the line. Tuned for a smooth power-band to put down predictable and even power in all gears and throttle positions. This smoothness improves the quality of the shifting and the overall drivability. From a standing start (with the traction control fully disengaged) all it takes is the press of the throttle to the floor to get the tires spinning. The everyday practicality of a full-size sedan with the fun of a sports car, this is the definition of "Performance Without Sacrifice". With Dinan's software, your 550i will be capable of achieving its natural top speed as the governor has been removed. And as always, Dinan matches the new car warranty coverage for up to 4 years or 50,000 miles, including the possibility of consequential damages. No one offers better performance or backs it up with such comprehensive warranty coverage.


  • More Power (with exhaust and intake/strut brace): Max gains of +109 HP @ 6000 RPM and +96 lb-ft TRQ @ 6000 RPM
  • 50 State Emissions legal; CARB EO # D-176-39
  • Improved throttle response
  • Top speed governor removed
  • Full Map Rescaling, for drivability from idle to wide open throttle and everywhere in between
  • Properly Returned Fuel Mixtures, to save you gas and protect your engine
  • Retain all BMW factory engine damage safeguards


Dinan Point Value3
Emission Code1
Factory Rated HP400
Factory Rated Torque (lb-ft)450
Labor Time (Hours)0.5
Max HP Gain109 @ 6000 RPM
Max Torque (lb-ft) Gain96 @ 6000 RPM
Peak HP507 @ 5000 RPM
Peak HP Gain70 @ 5000 RPM
Peak Torque (lb-ft)583 @ 3500 RPM
Peak Torque (lb-ft) Gain89 @ 3500 RPM
Product TypeEngine Software
Required ItemsDinan Cold Air Intake / Strut Brace (D760-0032)
Part NumberD903-44T54



This part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number.

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle

Tech Resources

Not compatible with the 550i (F07/F10) from 2014-2016. Dinan High Flow Intake/Strut Brace is required in order to run the Stage 4 Performance Engine Software.



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    Some parts are not legal for use in California or other states with similar regulations.