Dinan Stage 4 Performance Engine Software - 1997-1998 BMW 540i


PART# D903-4454

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Stage 4 Engine Software is for use with the High Flow Cold Air Intake and Air Flow Meter, ensuring optimum performance and drivability. Dinan Performance Engine Software unleashes more power from your BMW 540i E39 by re-programming the fuel mixture and ignition timing parameters of the engine management system. Furthermore, the software safely raises the rev-limit, giving your BMW a broader power band and greater road speed potential in each gear. Significant gains are also achieved at part throttle, making extra power available where you spend the bulk of the time driving. As an example, a peak gain of 8 horsepower at 3500 rpm has been achieved at part throttle with the revised programming.


  • More Power (with intake and air flow meter): Max gains of +23 HP and +25 lb-ft TRQ
  • 50 State Emissions legal; CARB EO # D-176-26
  • Top speed governor removed
  • Rev-limit increased
  • Improved throttle response
  • Smooth and predictable power delivery


Dinan Point Value3
Emission Code1
Factory Rated HP282
Factory Rated Torque (lb-ft)310
Labor Time (Hours)0.5
Max HP Gain23
Max Torque (lb-ft) Gain25
Product TypeEngine Software
Required ItemsDinan Cold Air Intake (NLA) and Air Flow Meter (NLA)
Part NumberD903-4454



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 540i (E39) from 1999-2003. Dinan Cold Air Intake System and Air Flow Meter are 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.