Approval Details

Valid E.O.


This Executive Order approved the specified parts on on March 8, 2004.
As of Saturday, February 24th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1996-2004 non-SFTP GM Trucks, 1996-2004 Ford Trucks, excluding SULEVs, and 2001-2003 non-SFTP PT-Cruisers, excluding any General Motors vehicle certified to the Ultra Low Emission Vehicle (ULEV) emission standards and 2004 model-year Ford trucks with the following engine test groups: 4FMXTO5.4R17, 4FMXTO5.4R4P, 4FMXTO5.4RM6, and 4FMXTO4.62E6..The WhippleCharger consists of the following main components in all kits: Twin Screw Whipple supercharger, intake manifold, bypass valve, a low temperature thermostat to replace the stock thermostat, and a new air cleaner element for use in the stock air cleaner housing. Intercooler is included on selected kits and denoted as IC in the part number. The General Motors kit also includes a reflashed ECM, a stand alone computer, and two extra injectors. Boost is limited to 8 psi. For Ford, the 3.0L kit includes a reflashed ECM, a set of high flow injectors, a larger diameter mass airflow sensor and throttle body. Boost is limited to 11 psi. The 4.6/5.4L kit includes a reflashed ECM and set of high flow injectors. Boost is limited to 10 psi. The 6.8L kit includes a reflashed ECM, a stand alone computer, and two extra injectors. Boost is limited to 8 psi. The PT-Cruiser kit includes a stand alone computer, and one extra injector. Boost is limited to 9.2 psi.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-231-21
  • Executive Order 231-21 / D231-21
  • ARB # D-231-21
  • Executive Order No: D-231-21
  • C.A.R.B. No. D-231-21
  • Resolution D-231-21
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-231-21 PDF

D-231-21 Document:

Current View

Previous E.O. D-231-20 | Previous E.O. D-230 | Next E.O. D-231-22 | Next E.O. D-232