Dinan Performance Engine Software unleashes more power from your BMW 540i E39 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. The top speed governor has also been eliminated, enabling the vehicle to achieve its natural top speed.

Stage 1 Features:

• More Power: Max gains of +9 HP @ 4500 RPM and +11 lb-ft TRQ @ 2000 RPM
• 50 State Emissions legal; CARB EO # D-176-26
• Top speed governor removed
• Rev-limit increased
• Improved throttle response
• Smooth and predictable power delivery
  
  
  Not compatible with the 540i (E39) from 1997-1998.
  

Stage 2 Engine Software is for use with the High Flow Cold Air Intake, ensuring optimum performance and drivability.

Stage 2 Features:

• More Power (with intake): Max gains of +18 HP and +20 lb-ft TRQ
• 50 State Emissions legal; CARB EO # D-176-26
• Top speed governor removed
• Rev-limit increased
• Improved throttle response
• Smooth and predictable power delivery
  
  
  Not compatible with the 540i (E39) from 1997-1998.
  
  Dinan Cold Air Intake System is required in order to run the Stage 2 Performance Engine Software.
  
  

Stage 3 Engine Software is for use with the High Flow Cold Air Intake and Throttle Body, ensuring optimum performance and drivability.

Stage 3 Features:

• More Power (with intake and throttle body): Max gains of +24 HP and +23 lb-ft TRQ
• 50 State Emissions legal; CARB EO # D-176-26
• Top speed governor removed
• Rev-limit increased
• Improved throttle response
• Smooth and predictable power delivery
  
  
  Not compatible with the 540i (E39) from 1997-1998.
  
  Dinan Cold Air Intake System and Throttle Body are required in order to run the Stage 3 Performance Engine Software.
  

Stage 4 Engine Software is for use with the High Flow Cold Air Intake, Throttle Body and Air Flow Meter, ensuring optimum performance and drivability.

Stage 4 Features:

• More Power (with intake, throttle body and air flow meter): Max gains of +30 HP and +27 lb-ft TRQ
• 50 State Emissions legal; CARB EO # D-176-26
• Top speed governor removed
• Rev-limit increased
• Improved throttle response
• Smooth and predictable power delivery
  
  
  Not compatible with the 540i (E39) from 1997-1998.
  
  Dinan Cold Air Intake System, Throttle Body and Air Flow Meter are required in order to run the Stage 4 Performance Engine Software.
  
  

Stage 5 Engine Software is for use with the High Flow Cold Air Intake, Throttle Body, Air Flow Meter, and Intake Manifold, ensuring optimum performance and drivability.

Stage 5 Features:

• More Power (with intake, throttle body, air flow meter and intake manifold): Max gains of +37 HP and +31 lb-ft TRQ
• 50 State Emissions legal; CARB EO # D-176-26
• Top speed governor removed
• Rev-limit increased
• Improved throttle response
• Smooth and predictable power delivery
  
  
  Not compatible with the 540i (E39) from 1997-1998.
  
  Dinan Cold Air Intake System, Throttle Body, Air Flow Meter and Intake Manifold are required in order to run the Stage 5 Performance Engine Software.