Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 21, 2016.
As of Monday, September 23rd, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
see pdfsee pdfsee pdf

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-763
  • Executive Order 763 / D763
  • ARB # D-763
  • Executive Order No: D-763
  • C.A.R.B. No. D-763
  • Resolution D-763
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-763 PDF

D-763 Document:

                               AIR RESOURCES BOARD

                               EXECUTIVE ORDER D—763

                      Relating to Exemptions Under Section 27156
                                 of the California Vehicle Code

                                        MBRP, Inc.
                                   Duramax Down Pipe

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—14—012;

IT IS ORDERED AND RESOLVED: That the installation of the Duramax Down Pipe,
manufactured and marketed by MBRP, Inc., 315 Old Ferguson Road, Huntsville,
Ontario P1H 2J2, has been found not to reduce the effectiveness of the applicable
vehicle pollution control systems and, therefore, is exempt from the prohibitions of
Section 27156 of the Vehicle Code for the following 2001 to 2015 model year General
Motors pickups, equipped with a 6.6L diesel engine:

Part Number          Application
GMCA425              2001 to 2004
GMCA424              2004.5 to 2010
GMCA42T .            2011 to 2015

The Duramax Down Pipe is a direct fit mild steel down pipe that is attached to the
exhaust output of the stock turbocharger and the vehicle‘s under floor exhaust
system. The stock down pipe and the Down Pipe share the same construction
material, metal gage, interior volume, length, and port size, the only difference is the
stock pipe is square in the middle section and the Down Pipe is round throughout.
The 2011 to 2015 model year vehicles are equipped with an EGT and NOx sensor
located at the top of the down pipe, the stock sensors are transferred to the new down
pipe in a stock location and orientation. The 2015 model year vehicles also include
an indirect fuel injector located at the bottom of the down pipe, the stock indirect fuel
injector is transferred to the new down pipe in a stock location and orientation.     The
Duramax Down Pipe has no mechanical or electrical user adjustments. No
changes are made to any component of the stock engine for installation,
including engine calibration, turbocharger, or any other component of the
exhaust system.

This Executive Order is valid provided that the installation instructions for the Duramax
Down Pipe 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 Duramax Down Pipe 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 Duramax Down Pipe using any identification other than that shown in
this Executive Order or marketing of the Duramax Down Pipe for an application other
than those listed in this Executive Order shall be prohibited unless prior approval is
obtained from the Air Resources Board.

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

This Executive Order is granted based on an engineering evaluation and information
supplied by MBRP, Inc. on the Duramax Down Pipe. Comparisons made between the
stock and modified part demonstrated similarity in material type, port size, and basic

The Air Resources Board 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

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 is made
after the hearing that grounds for revocation exist.

Executed at El Monte, California, this    Z{           day of April 2016.

                Annette Hebert, Chief
                Emissions Compliance, Automotive Regulations and Science Division

                    MBRP, INC. — DURAMAX DOWN PIPE — D—763

Document Created: 2016-07-25 19:39:19
Document Modified: 2016-07-25 19:39:19

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