Approval Details

Valid E.O.


This Executive Order approved the specified parts on on June 28, 1993.
As of Tuesday, October 15th, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
300hp1986-1993 Ford Mustang 5.0L V8 gasoline enginesRelocation of air injection hoses. Retard ignition timing from 10 degrees BTDC to 5 degrees BTDC. Install one -way check valve between PCV and inlet manifold.
375hp1986-1993 Ford Mustang 5.0L V8 gasoline engines

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-321
  • Executive Order 321 / D321
  • ARB # D-321
  • Executive Order No: D-321
  • C.A.R.B. No. D-321
  • Resolution D-321
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-321 PDF

D-321 Document:

                                                      (Page 1 of 3)

                                State of California
                                AIR RESOURCES BOARD

                               EXECUTIVE ORDER D=321
              «      Relating to Exemptions Under Section 27156
                                of the Vehicle Code

                       300, 375 & 450 HP TWIN TURBO SYSTEMS

 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 Sections 39515 and
 39516 of the Health and Safety Code and Executive Order G—45—5;

 IT IS ORDERED AND RESOLVED:  That the installation of the 300, 375 & 450 HP
 Twin Turbo Systems manufactured by Design, Development & Manufacture
 (International) PTY. LTD. (DDMI) of 1 Elizabeth Street, Hawthorn Vic. 3122,
 have been found not to reduce the effectiveness of the applicable vehicle
 pollution control system and, therefore, are exempt from the prohibitions of
 Section 27156 of the Vehicle Code for installation on the following 5.0L V8
 Ford Mustangs:

 Model—Year       Twin Turbo System .                 Components

 1986—93               300 HP                Two Garrett Airesearch T—25
                                             turbochargers with a turbine area
                                             ratio (A/R) of 0.64, two open
                                             element replacement air cleaners,
                                             modified exhaust manifolds, and
                                             new airflow meter housing.

1986—93              375 HP                  Same components as the 300 HP kit
                                             plus an intercooler, high volume
                                             fuel pump, one additional fuel
                                             injector, and a fuel controller.

1990—93                450 HP                Same components as the 375 HP kit
                                             plus one additional fuel injector,
                                             ‘throttle body, EGR spacer, intake
                                             manifold, after catalyst exhaust
                                             tubing, rocker arms, and cylinder

Modifications to the OEM emission control systems for all turbo systems
includes the relocation of air injection hoses, retarding ignition timing
from stock 10° BTD¢ to 5° BTDC, and the installation of a one way valve
between the P.C.V. valve and inlet manifold.

DDMI                                                        EXECUTIVE ORDER D—321
                                                            (Page 2 of 3)

This Executive Order is valid provided that installation instructions for
the 300, 375 & 450 HP Twin Turbo Systems will not recommend tuning the
vehicle to specifications different from those submitted by DDMI.

Changes made to the design or operating conditions of the 300, 375 & 450 HP
Twin Turbo Systems, as exempt by the Air Resources Board, which adversely
affect the performance of a vehicle‘s pollution control system shall
invalidate this Executive Ordéer.

Marketing of the 300, 375 & 450 HP Twin Turbo Systems using any
identification other than that shown in this Executive Order or marketing of
the 300, 375 & 450 HP Twin Turbo Systems 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 300, 375 & 450 HP
Twin Turbo Systems 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 these 300, 375 & 450 HP Twin Turbo Systems may have on any warranty
either expressed or implied by the vehicle manufacturer.

This Executive Order is grantéed based on results from emissions tests
conducted in accordance with Cold—Start CVS—75 Federal Test Procedure.
However,   the ARB finds that reasonable grounds exist to believe that use of
the 300, 375 & 450 HP Twin Turbo Systems 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 300, 375 & 450 HP Twin
Turbo Systems adversely affect emissions during off—cycle conditions
{(defined as those conditions which are beyond the parameters of the Cold—
Start CVS—75 Federal Test Progedure), 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 300, 375 & 450 HP Twin Turbo Systems will affect the
durability of the emission control system, DDMI 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 modifiedpart
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.                                              .

DDMI               —                                    EXECUTIVE ORDER D—321
                                                        (Page 3 of 3)

300, 375 & 450 HP TWIN TURBO SYSTEMS.                .

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 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 2(?~__ day of June, 1993.

                                    R.   BI

                                    Assistant Di
                                    Mobile Source Division

Document Created: 2005-09-01 12:42:52
Document Modified: 2005-09-01 12:42:52

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