Dinan Stage 4 Performance Engine Software - 2001-2002 BMW Z3M


PART# D903-34Z4

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$249.95   Suggested Retail
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Stage 4 Engine Software is for use with the Free Flow Exhaust, High Flow Cold Air Intake/Air Mass Meter Assembly and High Flow Throttle Bodies, ensuring optimum performance and drivability. Dinan Performance Engine Software unleashes more power from your BMW Z3 M by re-programming the fuel mixture and ignition timing parameters of the engine management system. Significant gains are also achieved at part throttle making extra power available where you spend the bulk of the time driving. Throttle response is improved through re-calibration of the drive by wire system. The top speed governor has also been effectively eliminated, enabling the vehicle to achieve it's "natural" top speed.


  • More Power (with exhaust, intake/air mass meter assembly and throttle bodies): Max gains of +28 HP and +23 lb-ft TRQ
  • 50 State Emissions legal; CARB EO # D-176-26
  • Improved throttle response
  • Top speed governor removed
  • Smooth and predictable power delivery


Dinan Point Value3
Emission Code1
Factory Rated HP315
Factory Rated Torque (lb-ft)251
Labor Time (Hours)0.5
Max HP Gain28
Max Torque (lb-ft) Gain23
Product TypeEngine Software
Required ItemsDinan Free Flow Exhaust (NLA), Cold Air Intake/Air Mass Meter Assembly (NLA) and Throttle Bodies (D760-3400)
Part NumberD903-34Z4



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 Z3M (E36/7/8) from 1998-2000. Dinan Free Flow Exhaust, High Flow Cold Air Intake/Air Mass Meter Assembly and High Flow Throttle Bodies are required in order to run the Stage 4 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.