Approval Details

Valid E.O.


This Executive Order approved the specified parts on on February 4, 1998.
As of Sunday, September 22nd, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModels
5300501996-1997 GM C/K 1500/2500/3500 5.0L with 73mm pulley diameter

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-231-11
  • Executive Order 231-11 / D231-11
  • ARB # D-231-11
  • Executive Order No: D-231-11
  • C.A.R.B. No. D-231-11
  • Resolution D-231-11
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-231-11 PDF

D-231-11 Document:

                                                                          (Page 1 of 2)

                                           State of California
                                       AIR RESOURCES BOARD

                                     EXECUTIVE ORDER D—231—11
                              Relating to Exemptions Under Section 27156
                                           of the Vehicle Code

                                     WHIPPLE INDUSTRIES, INC.
                                      8 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 Street, 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

Year     Engine      Body (2/4wd)                  Kit #s              Pulley Diameter
1996/97 5.0L          C/K 1500/2500/3500            530050                73mm
                                                   530051                 7O0mm
1998                                               530052          m      73mm
                                                   530053 .               7O0mm

1996/97 5.7L          C/K 1500/2500/3500           530150                 7O0mm
                                                   530151                 66mm
1998*                                              530152                 70mm
                                                   530153                 66mm

1996/97 74L          C/K 2500/3500, &              710150                 60mm
                      Motorhomes                   710151                 57mm
1998                                               710152                 60mm
                                                   710153                 57mm

* Engine families WGMXA05S.7185 & WGMXA05S.7185, certified to a Low Emission Vehicle
  (LEV) standard, are excluded for this Executive Order.

The WhippleCharger kit includes the following main components: Twin Screw supercharger, auxiliary
fuel pump, and uses 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.

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.

Whipple Induétries, Inc.                                                   Executive Order D—231—11
 Supercharger                                                              (Page 2 of 2)

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.

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 comparative intake manifold air pressure that was recorded
during a Hot—Start 505 LA4 drive cycle in the baseline and modified configuration. Test data showed
that the Whipple supercharger did not operate during the Hot—Start 505 drive cycle and thus could not
affect the emissions of the vehicle. 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 exist.
Executed at El Monte, California, this Qf       day of February 1998.

                                        R. B. Summerfield, Chief
                                        Mobile Source Operations Division

Document Created: 2005-09-01 12:41:30
Document Modified: 2005-09-01 12:41:30

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