Approval Details

Valid E.O.

Validity

This Executive Order approved the specified parts on on September 16, 1998.
As of Friday, August 23rd, 2019 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
PAC0011988-95 GM 5.0/5.7L trucksThe Hi-Flow Intake System replaces the stock air filter box with a cotton gauze open element reusable air filter, intake system tubing, assorted brackets, and hardware

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-436-4
  • Executive Order 436-4 / D436-4
  • ARB # D-436-4
  • Executive Order No: D-436-4
  • C.A.R.B. No. D-436-4
  • Resolution D-436-4
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-436-4 PDF

D-436-4 Document:



                                                       (Page 1 of 2)

                               State of California
                               AIR RESOURCES   BOARD



                             EXECUTIVE ORDER D—436—4
                  Relating to Exemptions Under Section 27156
                              of the Vehicle Code


                                STILLEN SPORTPARTS
                              HI—FLOW INTAKE SYSTEM


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 Hi—Flow Intake
System, manufactured by DJ Motorsports   (D—458)   and marketed by Stillen
Sportparts, 3176 Airway Avenue, Costa Mesa, California 92626 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 General Motors vehicles:  1988—95 (p/n
PACOO1) and 1996—98 (p/n VOROO2 & VOROOZR) Suburban,    Pick—up,   Tahoe,   & Yukon,
equipped with Vortec 5.0 and 5.7 liter engines.

The Hi—Flow Intake System includes the following main components:  cotton
gauze open—element reusable air filter, intake system tubing, assorted
brackets, and hardware.

This Executive Order is valid provided that the installation instructions for
the Hi—Flow Intake System 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 Hi—Flow Intake
System, 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 Hi—Flow Intake System using any identification other than
that shown in this Executive Order or marketing of the Hi—Flow Intake System
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 Hi—Flow Intake System 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 Hi—Flow Intake System may have on any warranty either expressed or
implied by the vehicle manufacturer.

It has been determined that the Stillen Sportparts Hi—Flow Intake System meets
the criteria for exempting general criteria parts as specified in the
"Procedures for Exemption of Add—On and Modified Parts".     However,   the ARB
finds that reasonable grounds exist to believe that use of the Stillen


éTILLEN SPORTPARTS                                      '   EXECUTIVE ORDER D—436—4
HI—FLOW INTAKE SYSTENM                                       (Page 2 of 2)


Sportparts Hi—Flow Intake System may adversely affect emissions of motor
vehicles when operating under conditions outside the parameters of the CVS—75
Federal Test Procedure.  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 Stillen Sportparts Hi—Flow Intake System
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 Hi—Flow Intake
System will affect the durability of the emission control system, Stillen
Sportparts 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.

THILS EXECUTIVE ORDER DOES NOT CONSTITUTE A CERTIFICATION, ACCREDITATION,
APPROVAL, OR ANY OTHER TYPE OF ENDORSEMENT BY THE AIR RESOURCES BOARD OF ANY
CLAIMS OF THE APPLICANT CONCERNING ANTI—POLLUTION BENEFITS OR ANY ALLEGED
BENEFITS OF STILLEN SPORTPARTS‘ HI—FLOW INTAKE SYSTEM.

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.                        L
                                              { T
Executed at El Monte, California, this        é’             September 1998.




                                         R. B.     Summerfield,    Chief
                                         Mobile Source Operations Division


                              State of California
                             AIR RESOURCES BOARD




                      EVALUATION OF STILLEN SPORTPARTS‘
                             HI—FLOW INTAKE SYSTEM
             FOR EXEMPTION FROM THE PROHIBITIONS OF VEHICLE CODE
       SECTION 27156 IN ACCORDANCE WITH SECTION 2222, TITLE 13, OF THE
                        CALIFORNIA CODE OF REGULATIONS




                                September 1998




                                      by
                      Mobile Source Operations Division
                             9528 Telstar Avenue
                             El Monte, CA 91731




(This report has been reviewed by the staff of the California Air Resources
Board and approved for publication. Approval does not signify that the
contents necessarily reflect the views and policies of the Air Resources
Board, nor does mention of trade names or commercial products constitute
endorsement or recommendation for use.)


                                          SUMMARY



             Stillen Sportparts of 3176 Airway Avenue, Costa Mesa, California

92626 has applied for an exemption from the prohibitions in Section 27156 of

the California Vehicle Code      (VC)   for the Hi—Flow Intake System designed for

the following General Motors vehicles:         1988—95   (p/n PACOO1)   and 1996—98   (p/n

VOROO2 & VOROO2ZR)   Suburban, Pick—up, Tahoe, & Yukon, equipped with Vortec 5.0

and 5.7 liter engines.

             Based on engineering evaluation and an examination of the On—Board

Diagnostic II    (OBD—II)   system with the Hi—Flow Intake System installed, the

staff concludes that the Stillen Sportparts Hi—Flow Intake System will not

adversely affect exhaust emissions from vehicles for which the exemption is

requested.

             The staff recommends that Stillen Sportparts be granted an exemption

as requested and that Executive Order D—436—4 be issued.


                                TABLE OF CONTENTS



                                                    Page Number



SUMMARY

CONTENTS                                               1i

I.     INTRODUCTION

II.    CONCLUSION

III.   RECOMMENDATION

IV.    HI—FLOW INTAKE SYSTEM DESCRIPTION

v.     DISCUSSION OF THE HI—FLOW INTAKE SYSTEM




                                       i1


                           EVALUATION OF STILLEN SPORTPARTS‘
                                 HI—FLOW INTAKE SYSTEM
                FOR AN EXEMPTION FROM THE PROHIBITIONS OF VEHICLE CODE
           SECTION 27156 IN ACCORDANCE WITH SECTION 2222, TITLE 13, OF THE
                            CALIFORNIA CODE OF REGULATIONS


I.     INTRODUCTION

             Stillen Sportparts of 3176 Airway Avenue, Costa Mesa, California

92626 has applied for an exemption from the prohibitions in Section 27156 of

;he California Vehicle Code (VC)         for the Hi—Flow Intake System designed for

the following General Motors vehicles:            1988—95   (p/n PACOO1)    and 1996—98 (p/n

VOROO2 & VOROO2ZR)    Suburban,    Pick—up,   Tahoe,   & Yukon,   equipped with Vortec 5.0

and 5.7 liter engines.

II.     CONCLUSIONS

             Based on engineering evaluation and an examination of the On—Board

Diagnostic II     (OBD—II)   system with the Hi—Flow Intake System installed, the

staff concludes that Stillen Sportparts‘ Hi—Flow Intake System will not

adversely affect exhaust emissions from the vehicles for which the exemption

is requested.

III.      RECOMMENDATION

            The staff recommends that Stillen Sportparts be granted an exemption

for their Hi—Flow Intake System for installation on the following General

Motors vehicles:      1988—95    (p/n PACOO1l)   and 1996—98   (p/n VOROO2 & VOROOZR)

Suburban, Pick—up, Tahoe, & Yukon, equipped with Vortec 5.0 and 5.7 liter

engines.

IV.    HI—FLOW INTAKE SYSTEM DESCRIPTION

            The Stillen Sportparts Hi—Flow Intake System has been specifically

designed for installation on the following General Motors vehicles:                    1988—95

(p/n PACOO1)    and 1996—98     (p/n VOROO2 & VOROOZR)      Suburban,   Pick—up,   Tahoe,   &

Yukon, equipped with Vortec 5.0 and 5.7 liter engines.              The system operates in

conjunction with the original equipment manufacturer‘s              (OEM)   computer

controlled fuel injection system and emission control system already certified

with the stock engine, with the exception of the stock airbox and some intake

tubing.

            The intent of installing the Stillen Sportparts Hi—Flow Intake

System is to increase its volumetric efficiency and power output at particular


engine loads and throttle openings.      At heavy engine loads and increased

throttle openings, the airflow into the engine is increased because the Hi~—

Flow Intake System is less restrictive than the stock air filter.        This allows

more air to enter the engine, which is compensated by the vehicle engine

control module with an increase in fuel flow, resulting in a higher power

cutput.

          The Hi—Flow Intake System consists of the following main components:

cotton gauze open—element reusable air filter, intake system tubing,       assorted

brackets, and hardware.     The filter element used in the Hi—Flow Intake System

is an open—element,    reusable cotton gauze unit, designed to be less

restrictive than the stock air filter.

          The installation of the kit does not require any major modifications

to the stock motor,    except for the modification of the factory air intake

system to accommodate the Hi—Flow Intake System air filter and plumbing.



v.        DISCUSSION OF THE HI—FLOW INTAKE SYSTEM

          Similar systems have been tested and have shown to have only a

slight influence on emissions,     namely a marginal increase in NOx due to a

leaning effect of the less restrictive intake system.      The vehicle fuel system

compensates for the lower restriction of the intake system, but there is

usually a measurable (but not significant)     increase in NOx.   Certification

emissions for this engine family were sufficiently below the standards       (NOx in

particular) to forego emissions testing for the Stillen Sportparts Hi—Flow

Intake System.     The evaporative emissions of the effected vehicles will not be

a concern because the stock evaporative system is not directly affected by the

installation of Hi—Flow Intake Kit.     The only possible indirect influence to

result from the lower restriction of the Hi—Flow Intake System would be a

marginal decrease in manifold vacuum.      However, at small throttle openings,

the restriction presented by the throttle would outweigh any decrease in

vacuum due to the less restrictive nature of the Hi—Flow Intake System.         It is

at low—throttle,   high vacuum,   driving conditions that the evaporative systems

draw air through purge canisters for combustion in the engine.

          Because the interaction with the stock GM OBD—II system was the only

factor left unknown when installing the Hi—Flow Intake System on the

                                         —2—


applicable vehicles,       only OBD—II testing was required of Stillen Sportparts.

A 1998 GM K—1500 Suburban 4WD with a 5.7L sequential multipoint fuel injected

engine    (WGMXAOS.7186)   was used for the evaluation of the Hi—Flow Intake

System.    The test vehicle was certified to medium—duty vehicle—3 low—emission

vehicle standards and was equipped with OBD—I1 and an enhanced evaporative

system.    The dynamometer inertia weight and horsepower settings were 6,500—lbs

and 16.1—hp, respectively.        Testing consisted of two CVS—75 FTP‘s in the

modified configuration to set all readiness codes.         The ARB did not perform

testing to confirm the test results submitted by the applicant.

             Examination of the OBD II system showed the Stillen Sportparts Hi—

Flow Intake System does not affect OBD II operation.         Therefore, based on the

test results,    the staff concludes that the Stillen Sportparts Hi—Flow Intake

System meets the criteria for exempting general criteria parts as specified in

the "Procedures for Exemption of Add—On and Modified Parts".         However,   the ARB

finds that reasonable grounds exist to believe that use of the Stillen

Sportparts Hi—Flow Intake System may adversely affect emissions of motor

vehicles when operating under conditions outside the parameters of the

previously prescribed test procedure.       Accordingly,   the ARB reserves the right

to conduct additional emission tests in the future,        as such tests are

developed.

             Stillen Sportparts has submitted all the required information and

fulfilled the requirements for an exemption.



Document Created: 2005-09-01 12:43:17
Document Modified: 2005-09-01 12:43:17

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