Dinan Performance Engine Software - 1996-1998 BMW 840Ci


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Dinan Performance Engine Chips unleash more power 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.


  • More Power: Max gains of +8 HP @ 4500 RPM and +13 lb-ft TRQ @ 2000 RPM
  • Top speed governor removed
  • Rev-limit increased
  • Improved throttle response
  • Smooth and predictable power delivery
Brand Dinan
Dinan Point Value3
Emission Code1
Factory Rated HP282
Factory Rated Torque (lb-ft)310
Labor Time (Hours)0.5
Max HP Gain8 @ 4500 RPM
Max Torque (lb-ft) Gain13 @ 2000 RPM
Peak HP288 @ 5700 RPM
Peak Torque (lb-ft)330 @ 4000 RPM
Product TypeEngine Software
Part NumberD900-448

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
Not compatible with the 840Ci (E31) from 1992-1996.

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