Approval Details

Valid E.O.

Validity

This Executive Order approved the specified parts on on July 24, 2003.
As of Sunday, December 9th, 2018 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
THY-3092002-2003 General Motors trucks and motorhomes 4.8/5.3LThe Summit Industries, Inc.'s Thorley Headers are a shorty style header, manufactured out of 14 gage mild steel. The headers bolt to the stock connecting pipes and retain the oxygen sensor in the stock location.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-540-1
  • Executive Order 540-1 / D540-1
  • ARB # D-540-1
  • Executive Order No: D-540-1
  • C.A.R.B. No. D-540-1
  • Resolution D-540-1
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-540-1 PDF

D-540-1 Document:



                                      State of California
                                  AIR RESOURCES BOARD

                                 EXECUTIVE ORDER D—540—1

                        Relating to Exemptions Under Section 27156
                                     of the Vehicle Code

                                    Summit Industries, Inc.
                                       Thorley Headers

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

Pursuant to the authority vestedin the undersigned by Sections 39515 and 39516 of the
Health and Safety Code and Executive Order G—02—003;

T 15 ORDERED AND RESOLVED: That the installation of Thorley Headers, manufactured
by Summit Industries, Inc. of 1220 Railroad Street, Corona, California 92882, 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 applicable General Motors trucks and motorhomes:

Part No.       Application

THY—309        2002—2003    4.8/5.3L
THY—312        2000—2003    6.0L
THY—314        2000—2003    7.4/8.1L
THY—362 ,      1996—2003    4.3L

The Summit Industries, Inc.‘s Thorley Headers are a shorty style header, manufacturedout
of 14 gage mild steel. The headers bolt to the stock connecting pipes and retain the
oxygen sensor in the stock location.

This Executive Order is valid provided that installation instructions for this device will not
recommend tuning the vehicles to specifications different from those of the vehicle
mantufacturer.

This Executive Order shall not apply to any Summit Industries, Inc.‘s Thorley Header
advertised, offered for sale, sold with, or installed on a new motor vehicle prior to or
concurrent with transfer to an ultimate purchaser.

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

Marketing of this device using any identification other than that shown in this Executive
Order or marketing of this device for an application other than those listed in this Executive
Order shail be prohibited unless prior approval is obtained from the Air Resources Board.


                                              _3


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

This Executive Order is granted based on emissions test data generated on a 2003 model
year General Motors 5.3L C1500 truck certified to the Ultra Low—Emission Vehicle (ULEV)
emission standards. Emission levels of the modified vehicle met the applicable emission
standards over the Cold—Start CVS—75 Federal Test Procedure (FTP) and the Supplemental
Federal Test Procedure (USO6) test cycles. Results are in grams per mile with deterioration
factors added to CVS—75 FTP results:

                             CVS—75                           USO6

                  NMOG CO         NOx      HCHO          NMHC+NOx         CO
Standards         0.100 4.4      0.4      0.009              0.40         10.5
Device            0.052 1.3      0.       0.001              0.38          0.5

This Executive Order is also based on an On Board Diagnostic II (OBD 1I) testing—which showed _
that the Thorley Header when installed on the vehicle did not affect the vehicle‘s ability to perform
its OBD II monitoring.

THIS EXECUTIVE ORDER DOES NOT CONSTITUTE A CERTIFICATION, ACCREDITATION,
APPROVAL, OR ANY OTHER TYPE OF ENDORSEMENT BY THE AIR RESOURCES BOARD
OF CLAIMS OF THE APPLICANT CONCERNING ANTI—POLLUTION BENEFITS OR ANY
ALLEGED BENEFITS OF SUMMIT INDUSTRIES, INC.‘S THORLEY HEADERS.

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 reyoked only after ten days 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 will be held within ten days of receipt of the request and the order may not
be revoked until a determination is made after the hearing that grounds for revocation exist.

Executed at El Monte, California, this Z7 ”9 day of July 2003.




                                        AIIe%//'lfyons, Chief
                                        Mobile Source Operations Division




                    SUMMIT INDUSTRIES, INC. —THORLEY HEADERS—D—540—1



Document Created: 2005-09-01 12:42:11
Document Modified: 2005-09-01 12:42:11

Previous E.O. D-540 | Previous E.O. D-539 | Next E.O. D-540-2 | Next E.O. D-541