Approval Details

Valid E.O.


This Executive Order approved the specified parts on on March 16, 1999.
As of Thursday, October 17th, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
WIK-L35-4.3L1996-99 GM 4.3L trucks, 1.16L supercharger w/ 3.125" diameter pulleysame as above

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-231-13
  • Executive Order 231-13 / D231-13
  • ARB # D-231-13
  • Executive Order No: D-231-13
  • C.A.R.B. No. D-231-13
  • Resolution D-231-13
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-231-13 PDF

D-231-13 Document:

                                                                                                  (Page 1 of 2)

                                                             State of California
                                                       AIR RESOURCES BOARD

                                                    EXECUTIVE ORDER D—231—13
                                              Relating to Exemptions Under Section 27156
                                                            of the Vehicle Code

                                                      WHIPPLE INDUSTRIES, INC.
                                                       $ PSI WHIPPLECHARGER

         Pursuant to the authority vested in the Air Resources Board by Section 27156 of the Vehicle Code; and

         Pursuant to the authority vested in the undersigned by Section 39515 and Section 39516 of the Health and Safety
         Code and Executive Order G—45—9;

         IT IS ORDERED AND RESOLVED: That the installation of the WhippleCharger, manufactured and marketed by
         Whipple Industries, Inc., 3292 N. Weber Ave. Fresno, California, 93722 has been found not to reduce the
         effectiveness of the applicable vehicle pollution control system and, therefore, is exempt from the prohibitions of
         Section 27156 of the Vehicle Code for the following General Motors truck applications:

         Year            Engine              Kit #s              Pulley Diameter           Compressor Size

         1996—99         4.3L          WIK—L35—4.3L                 3.125"                         116L
         1999            4.8L          WIK—LR4—4.8L                 4.000"                         2.1L
         1996—99         5.0L          WIK—L30—5.0L                 4.375"                         2.1L
         1999            5.3L          WIK—LM7—5.3L                 3.875"                         2.1L
         1996—99         57L           WIK—L31—5.7L                 3.875"                         21L
         1999            6.0L          WIK—LQ4—6.0L                 3.375"                         2.1L
         1996—99         7 AL          WIK—L29—7.4L                 3.125"                         21L

         The WhippleCharger kit includes the following main components: Twin Screw Whipple supercharger, two auxiliary
         fuel injectors, air bypass valve, and the use of the stock closed element air cleaner.

         This Executive Order is valid provided that the installation instructions for the supercharger will not recommend
         tuning the vehicle to specifications different from those of the vehicle manufacturer. Whipple recommends that only
         92 octane fuel be used.

         Changes made to the design or operating conditions of the supercharger, as exempt by the Air Resources Board,
         which adversely affect the performance of the vehicle‘s pollution control system shall invalidate this Executive Order.

         This Executive Order shall not apply to any Whipple Industries supercharger kit advertised, offered for sale, or sold
         with or installed on, a motor vehicle prior to or concurrent with transfer to an ultimate purchaser.

         Marketing of the supercharger using any identification other than that shown in this Executive Order or marketing of
         the supercharger for an application other than those listed in this Executive Order shall be
         prohibited unless prior approval is obtained from the Air Resources Board. Exemption of the supercharger shall not
          be construed as exemption to sell, offer for sale, or advertise any component of the kit as an individual device.

Whipple Industries, Inc.                                                  Executive Order D—231—13
Supercharger                                                              (Page 2 of 2)

This Executive Order does not constitute any opinion as to the effect the use of the supercharger may have on any
warranty either expressed or implied by the vehicle manufacturer.

This Executive Order is granted based on the following emissions test data submitted by the kit manufacturer:

1999 5.3L C1500 truck certified to a Low Emission Vehicle (LEV) emission standard
                     NMOG       CO        NOX        HCHO
Standards            0.160      4 4A      0.4       0.018
device w/ dfs        0.105      1.3       0.4       0.002

Test results showed that the supercharger kit when installed on the vehicle did not cause tailpipe emissions to exceed
the vehicle‘s applicable emission standard during a Cold Start CVS—75 Federal Test Procedure. This Executive Order is
also based on On Board Diagnostic II (OBD II) testing conducted on the same test vehicle. Test data showed that the
supercharger kit when installed on the vehicle did not affect the vehicle‘s ability to perform its OBD II monitoring.

This Executive Order is granted based on submitted emissions test data which shows that emissions are not affected
during the Cold—Start CVS 75 Federal Test Procedure. However, the ARB finds that reasonable grounds exist to
believe that use of the Whipple supercharger may adversely affect emissions of motor vehicles when operating under
conditions outside the parameters of the previously prescribed test procedures. Accordingly, the ARB reserves the
right to conduct additional emission tests, in the future, as such tests are developed, that will more adequately measure
emissions from all cycle phases. If such test results demonstrate that the supercharger adversely affects emissions
during off—cycle conditions (defined as those conditions which are beyond the parameters of the Cold—Start CVS—75
Federal Test Procedure), this Executive Order shall be effectively rescinded as of the date the test results are
validated. Further, if such test results or other evidence provides the ARB with reason to suspect that the
supercharger will affect the durability of the emission control systems, Whipple shall be required to submit durability
data to show that the durability of the vehicle emission control system is not, in fact, affected and/or that the add—on
or modified part demonstrates adequate durability.

In addition to the foregoing, the ARB reserves the right in the future to review this Executive Order and the
exemption provided herein to assure that the exempted add—on or modified part continues to meet the standards and
procedures of Title 13, California Code of Regulations, Section 2222, et seq.


No claim of any kind, such as "Approved by the Air Resources Board", may be made with respect to the action taken
herein in any advertising or other oral or written communication.

 Violation of any of the above conditions shall be grounds for revocation of this order. The order may be revoked only
 after a ten—day written notice of intention to revoke the order, in which period the holder of the order may request in
 writing a hearing to contest the proposed revocation. If a hearing is requested, it shall be held within ten days of
 receipt of the request and the order may not be revoked until a determination after hearing that grounds for revocation

 Executed at El Monte, California, this    [[
                                                #—day of March 1999.

                                           . B. Summerfield, Chief
                                            obile Source Operations Division

Document Created: 2005-09-01 12:40:46
Document Modified: 2005-09-01 12:40:46

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