Approval Details

Valid E.O.


This Executive Order approved the specified parts on on December 27, 2000.
As of Thursday, July 25th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
PowerMax, PowerMax 2, & PowerMax1998 ?¢ and 1999 Dodge Ram Trucks equipped with the 5.9L ISB Cummins Turbo Diesel engineThe PowerMax Computers includes the following main parts: PowerMax Control Computer, boost altering bleed orifice or spring, and wiring harnesses. The PowerMax Computer is mounted under the vehicle's dashboard and has no user adjustments except for an on-off switch. Engine performance modifications include increasing the fuel delivery and modifying the turbo wastegate during boost conditions. An increase in fuel delivery is achieved by an increase in the fuel pulse width during high loads and wide open throttle conditions. The following is the maximum increase in fuel pulse width with the corresponding Powermax model: 20% on the PowerMax, 30% on the PowerMax 2, and 50% on the PowerMax 3.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-503
  • Executive Order 503 / D503
  • ARB # D-503
  • Executive Order No: D-503
  • C.A.R.B. No. D-503
  • Resolution D-503
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-503 PDF

D-503 Document:

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