Approval Details

Valid E.O.


This Executive Order approved the specified parts on on September 26, 1996.
As of Friday, September 20th, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
WIK4100, 4100-11993-1995 GM S-10 4.3LKit includes Twin screw supercharger, auxiliary fuel pump, closed element air cleaner, and new PROM chip on those with removable PROMS. The original heated air intake system is removed. Heated coolant water flows though the throttle body adapter.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-231-9
  • Executive Order 231-9 / D231-9
  • ARB # D-231-9
  • Executive Order No: D-231-9
  • C.A.R.B. No. D-231-9
  • Resolution D-231-9
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-231-9 PDF

D-231-9 Document:

                                                          (Page 1 of 2)

                              State of California
                              AIR RESOURCES   BOARD

                            EXECUTIVE ORDER D—231—9
                  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 applications as listed in EXhlblt A, which is attached hereto
and incorporated herein.

The WhippleCharger kit includes the following main components:  Twin Screw
supercharger, auxiliary fuel pump, closed element air cleaner, and new PROM
chip on those with removable PROMs.

The following modifications to the original equipment emission control systems
are allowed:  The original heated air intake system is removed and cold—
start emission problems are avoided by heated coolant water flowing through
the throttle—body adapter.

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 confiqguration. 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 Industries,    Inc.                   Executive Order D—231—9
                                              (Page 2 of 2)

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 Reqgulations, 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.                          a

Executed at El Monte,    California,   this        ay of September 1996.

                                                Exhibit A

(v"gg_      Engine   Body    __(2/4wd}     Kit #s                     Pulley Diameter

  1993—95 4.31L      s~—10                 wWIK4100, 4100—1                79mm

  1993—95   4.3L     C/K 1500/2500         wWIKA10L,    4101—1             79mm

  1993—95 5.01       C/K 1500/2500         WIKS100, 5101                   6Oram
                                           wWIKS5100—1, 5101—1             6Omm
  1996      5. oL    C/K 1500/2500/3500    WIKS5302,    5302Pp             7 3ram

                                           wWIKS30O2—1,   5302P—1          7 Oram

  1995/96 5.7L       AM General Hummer     WIKS5200,    5200—1             6 3mm

  1993—95   5.7L     C/K 1500/2500         wWIK5300,    5300—1             6 3mm

  1993—950 5.7L      Cc/K 2500/3500        wWIK5301,    5301—1             6 3mm

  1996      5.7L     C/K 1500/2500/3500    WIKS5303,    5303P,             7 Omm
                                           wWIK5303—1, 5303P—1             66mm

  1991—93   7.4L     C1500 SS              wWIK7100,    —7100—1            5 7mm

  1991—93   7.41L    K2500/3500            WIKT7101,    7101—1             57mm

  1991—93   7.4L     C2500/3500            wWIKT7105,   7105—1    —        5 7mm

  1991—93   7.41L    Motorhome             wWIKT7102,   7102—1             57rmm

  1994/95   7.4L     C/K 2500/3500         wWIKT7103,   7103—1             57mm

  1994/95   7.4L     Motorhome             wWIKT7104,   7104—1             5 7mm

  1996      7 .4L    C/K 2500/3500,        WIK7106,     7106P,             6Omm

                     Motorhomes            WIKT7106—1,    7106pP—1         57mm

  1993—95 5.7L       Camaro/Firebird       wWIKS700,    5700P              6Omm
                                           wWIK5S700—1,   5700pP—1         57mm

  1992—95   5.7L     Corvette              WIKS701,     5701IP             6Omm
                                           wWIK570O1—1,   5701P—1          5 7mm

  1993—95 5.7L       Impala,    Caprice,   wWIK5702,    5702P              6Ormm
                     Road Master           wWIKS7O2—1,    5702P—1         . 57mm
                     Deville (LT1)

  *   May require the use of a 139.7 mm diameter supplemental crankshaft pulley

Document Created: 2005-09-01 12:41:23
Document Modified: 2005-09-01 12:41:23

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