Approval Details

Valid E.O.


This Executive Order approved the specified parts on on December 24, 1996.
As of Tuesday, October 15th, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
WIK5302 WIK5302-11996-1997 GM C/K 1500/2500/3500 5.0LKit includes Twin Screw supercharger, auxiliary fuel pump, and closed element air cleaner.
WIK5303 WIK5303-11996-1997 GM C/K1500/2500/3500 5.7L

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-231-10
  • Executive Order 231-10 / D231-10
  • ARB # D-231-10
  • Executive Order No: D-231-10
  • C.A.R.B. No. D-231-10
  • Resolution D-231-10
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-231-10 PDF

D-231-10 Document:

                                                                   (Page 1 of 2)

                                         State of California~ s
                                         AIR RESOURCES BOARD

                                   EXECUTIVE ORDER D—231—10
                       Relating to Exemptions Under Section 27156
                                   of the Vehicle Code

                                   WHIPPLE INDUSTRIES, INC.
                                     8 PSI. WHIPPLECHARCGER

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
1996/97 General Motors applications:

Year      Engine     Body     _(2/4wd)         Kit #s                          Pulley Diameter

1996/97    5.01      C/K 1500/2500/3500        WIKS5302                            7 3mm
                                               WIKS302—1                           7Omm

1996/97    5.7L      C/K 1500/2500/3500        WIKS5303                            70Omm
                                               WIK5303—1                           66mm

1996/97    7.41L     C/K 2500/3500,       &     wWIK7106                           6Omm
                     Motorhomes                 wWIK7106—1                         5 7mm

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

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

Whipple Industries, Inc.                        Executive Order D—231~10
                                                (Page 2 of 2)

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.                       ’fl‘

Executed at El Monte,   California,   this    ;2 4"’aay of December 1996.

                                      Ao Meabts].
                                        .   Summerfield,
                                      bile Source Operations Division

Document Created: 2005-09-01 12:44:26
Document Modified: 2005-09-01 12:44:26

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