Dinan Performance Engine Software - 2004-2006 BMW 545i


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Performance Engine Software extracts additional power as well as improves 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: Max gains of +8 HP @ 6600 RPM and +6 lb-ft TRQ @ 6600 RPM
  • 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 Gain8 @ 6600 RPM
Max Torque (lb-ft) Gain6 @ 6600 RPM
Product TypeEngine Software
Part NumberD900-455

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
K&N free flow air filter element recommended for optimum performance.

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