Dinan Stage 3 Performance Engine Software - 2003-2005 BMW Z4


PART# D903-31Z3

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$199.95   Suggested Retail
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Stage 3 Engine Software is for use with the High Flow Cold Air Intake and/or Ram Air Duct and Throttle Body; optimizing performance and drivability. Dinan Engine Software safely raises the rev-limit by 240 RPM, endowing your car with a broader power band and greater road speed in each gear. The software also removes the top speed governor, enabling the cars to attain their "natural" top speed. Reprogramming of the drive by wire throttle system speeds up throttle response, dramatically reducing the delayed response to throttle inputs exhibited with the stock programming.


  • More Power (with intake and/or ram air duct and throttel body): Max gains of +11 HP and +9 lb-ft TRQ
  • 50 State Emissions legal; CARB EO # D-176-35
  • 240 RPM rev-limit increase
  • Improved throttle response
  • Top speed governor removed
  • Smooth and predictable power delivery


Dinan Point Value3
Emission Code1
Factory Rated HP225
Factory Rated Torque (lb-ft)214
Labor Time (Hours)0.5
Max HP Gain11
Max Torque (lb-ft) Gain9
Product TypeEngine Software
Required ItemsDinan Cold Air Intake (D760-0011) or Ram-Air Intact Duct (NLA) and Throttle Body (D760-3300A)
Part NumberD903-31Z3



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 Z4 3.0 (E85) from 2006-2008. Dinan Cold Air Intake System and/or Ram Air Ductas well as the Throttle Body are required in order to run the Stage 3 Performance Engine Software.



    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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