Dinan Stage 5 Performance Engine Software - 2000-2003 BMW Z8


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Stage 5 Engine Software is for use with the High Flow Air Mass Meters, Header System and Throttle Bodies/Velocity Stacks, ensuring optimum performance and drivability. Dinan Engine Software safely raises the rev-limit by 270 rpm, endowing your Z8 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. The software also speeds up throttle response in the standard mode and improves throttle modulation in the sport mode.


  • More Power (with air mass meters, header system and throttle bodies/velocity stacks): Max gains of +70 HP and +35 lb-ft TRQ
  • 50 State Emissions legal; CARB EO # D-176-37
  • 270 RPM rev-limit increase
  • Improved throttle response
  • Top speed governor removed
  • Smooth and predictable power delivery
Brand Dinan
Dinan Point Value3
Emission Code1
Factory Rated HP394
Factory Rated Torque (lb-ft)368
Labor Time (Hours)0.5
Max HP Gain70
Max Torque (lb-ft) Gain35
Product TypeEngine Software
Required ItemsDinan Air Mass Meters (NLA), Header System (NLA) and Throttle Bodies/Velocity Stacks (NLA)
Part NumberD903-50Z5

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
Dinan High Flow Air Mass Meters, Header System and Throttle Bodies/Velocity Stacks are required in order to run the Stage 5 Performance Engine Software.

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