Dinan Stage 2 Performance Engine Software - 2004-2005 BMW 645Ci


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Performance Engine Software tuned specifically for use with Dinan's High Flow Intake optimizing power output as well as improved drivability. The software safely raises the rev-limiter by 250 RPM enabling you to carry more road speed in each gear as well as optimize shift points. The top speed governor has been removed enabling the cars to reach their "natural" top speed. Revised EML tuning provides improved drivability by speeding up throttle response.


  • More Power (with intake): Max gains of +20 HP and +15 lb-ft TRQ
  • 50 State Emissions legal; CARB EO # D-176-35
  • 250 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 HP325
Factory Rated Torque (lb-ft)330
Labor Time (Hours)0.5
Max HP Gain20
Max Torque (lb-ft) Gain15
Product TypeEngine Software
Required ItemsDinan Cold Air Intake (NLA)
Part NumberD903-4562

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 Cold Air Intake is required in order to run the Stage 2 Performance Engine Software.

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