Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 14, 2004.
As of Saturday, February 24th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

2004 and older applicable Chrysler, Ford, and General Motors vehiclesThe throttle body spacers that are included in this Executive Order are the Torque Curve Spacer, Standard Spacer, Wide Open Spacer, and the Swirl Torque Spacer. Each spacer is designed for vehicles with either a multi-point or throttle body fuel injection system, and is installed under the throttle body.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-578
  • Executive Order 578 / D578
  • ARB # D-578
  • Executive Order No: D-578
  • C.A.R.B. No. D-578
  • Resolution D-578
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-578 PDF

D-578 Document:

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