In article
<1160074191.864451.91710@m7g2000cwm.googlegroups.com>,

What makes you think that you can do better than the OEM
engineers?

   I have talked to several people who have used them.  Dunno if they were
just trying to justify having spent their $ or fact: some claim that they
got a definite increase in performance, but a corresponding DROP in fuel
mileage.  Some also said they had to move up to premium fuel at the same
time.  Just what I've heard.  s

BennyB Wrote:

It may be and there is stuff out there to do it.
But beware it is on the border line of being illegal.
It is under the heading of tampering with emmisions.
So proceed at your own risk.
MT
Section 203  of the 1990 EPA clean air act defines tampering and
section 205 covers fines and jail time EXC.

http://www.epa.gov/air/caa/caa203.txt

Sec.  203. (a) The following  acts and the  causing thereof are
prohibited-
(1) in the case of a manufacturer of new motor vehicles or
new motor vehicle engines  for distribution in commerce, the
sale, or  the offering  for sale,  or  the introduction,  or
delivery for introduction, into commerce, or (in the case of
any person, except as provided by regulation of the Adminis-
trator), the importation into the United States, of  any new
motor  vehicle  or new  motor  vehicle  engine, manufactured
after  the effective  date  of regulations  under this  part
which are applicable  to such vehicle or  engine unless such
vehicle or engine is covered by a  certificate of conformity
issued (and  in effect) under  regulations prescribed  under
this  part  or part  C in  the  case of  clean-fuel vehicles
(except as provided in subsection (b));
(2)(A)  for any person to fail or refuse to permit access
to or  copying of  records or  to fail  to  make reports  or
provide information required under section 208;
(B)  for any  person to  fail or  refuse to  permit entry,
testing  or inspection  authorized  under section  206(c) or
section 208;
(C) for  any person to fail or refuse to perform tests, or
have tests performed as required under section 208;
(D)  for  any manufacturer  to  fail  to make  information
available as provided by regulation under section 202(m)(5);
(3)(A) for any person to remove or render  inoperative any
device  or  element of  design installed  on  or in  a motor
vehicle or  motor vehicle engine in  compliance with regula-
tions under this title prior to its sale and delivery to the
ultimate purchaser, or for any person knowingly to remove or
render  inoperative any  such  device or  element of  design
after such sale and delivery to the ultimate purchaser; or
(B) for any  person to  manufacture or sell,  or offer  to
sell,  or install,  any part or  component intended  for use
with,  or as  part of,  any motor  vehicle or  motor vehicle
engine, where a principal effect of the part or component is
to  bypass,  defeat, or  render  inoperative  any device  or
element  of design  installed on  or in  a motor  vehicle or
motor vehicle  engine in  compliance with regulations  under
this title, and where  the person knows or should  know that
such  part  or  component  is  being  offered  for  sale  or
installed for such use or put to such use; or
(4) for any  manufacturer of  a new motor  vehicle or  new
motor vehicle engine  subject to standards  prescribed under
section 202 or Part C-
(A)  to  sell or  lease  any such  vehicle  or engine
unless such  manufacturer  has complied  with  (i)  the
requirements of section 207 (a) and (b) with respect to
such  vehicle or engine, and  unless a label  or tag is
affixed to  such vehicle  or engine in  accordance with
section   207(c)(3),   or   (ii)    the   corresponding
requirements  of part  C  in  the  case of  clean  fuel
vehicles unless  the manufacturer has complied with the
corresponding requirements of part C
(B) to fail or refuse to comply with the requirements
of  section  207  (c)  or  (e),  or  the  corresponding
requirements  of  part C  in  the  case  of clean  fuel
vehicles
(C)  except  as  provided  in  subsection  (c)(3)  of
section 207  and the corresponding requirements of part
C  in the  case  of  clean  fuel vehicles,  to  provide
directly  or indirectly  in  any  communication to  the
ultimate purchaser or any subsequent purchaser that the
coverage of any warranty  under this Act is conditioned
upon use of any part, component, or system manufactured
by  such manufacturer  or  any person  acting for  such
manufacturer or  under his control, or conditioned upon
service performed by any such person, or
(D)  to fail or refuse  to comply with  the terms and
conditions of the warranty under section 207 (a) or (b)
or the corresponding requirements of part C in the case
of clean fuel vehicles with respect to any vehicle; or
(5)  for any person to violate section 218, 219, or part C
of  this title or any regulations under section 218, 219, or
part C.
No action with  respect to any element  of design referred to  in
paragraph  (3) (including  any adjustment  or alteration  of such
element)  shall  be  treated  as  a  prohibited  act  under  such
paragraph (3) if such  action is in accordance with  section 215.
Nothing  in paragraph (3) shall  be construed to  require the use
ofmanufacturer  parts  in  maintaining  or  repairing  any  motor
vehicle  or  motor  vehicle  engine.  For  the  purposes  of  the
preceding  sentence, the  term "manufacturer  parts" means,  with
respect  to a motor vehicle engine, parts produced or sold by the
manufacturer of  the motor  vehicle or  motor vehicle engine.  No
action with respect to  any device or element of  design referred
to in paragraph  (3) shall be treated  as a prohibited act  under
that paragraph if (i) the action is for the purpose  of repair or
replacement  of  the device  or element,  or  is a  necessary and
temporary procedure to repair  or replace any other item  and the
device or element is  replaced upon completion of  the procedure,
and (ii) such action thereafter results in the proper functioning
of the device or element referred to in paragraph (3).  No action
with  respect to any device  or element of  design referred to in
paragraph (3) shall  be treated  as a prohibited  act under  that
paragraph if the action is  for the purpose of a conversion  of a
motor vehicle for use of a clean  alternative fuel (as defined in
this title)  and if  such vehicle  complies  with the  applicable
standard under section 202 when operating on such fuel, and if in
the case  of a clean alternative fuel vehicle (as defined by rule
by the  Administrator), the device  or element  is replaced  upon
completion of the conversion procedure and such action results in
proper functioning  of  the  device or  element  when  the  motor
vehicle operates on conventional fuel.
(b)(1)  The Administrator may  exempt any new  motor vehicle or
new motor vehicle engine from subsection (a), upon such terms and
conditions  as he may find necessary for the purpose of research,
investigations,  studies,  demonstrations,  or  training,  or for
reasons of national security.
(2) A new motor vehicle or new motor vehicle engine offered for
importation  or imported by any person in violation of subsection
(a)  shall be refused admission  into the United  States, but the
Secretary of  the Treasury  and the  Administrator may,  by joint
regulation,  provide for  deferring  final  determination  as  to
admission and authorizing the delivery of such a motor vehicle or
engine  offered for import to the owner or consignee thereof upon
such terms and conditions (including the furnishing of a bond) as
may  appear to  them appropriate  to insure  that any  such motor
vehicle or  engine  will  be  brought into  conformity  with  the
standards, requirements, and  limitations applicable to it  under
this  part. The  Secretary  of the  Treasury  shall, if  a  motor
vehicle  or  engine  is  finally  refused  admission  under  this
paragraph,  cause  disposition  thereof in  accordance  with  the
customs laws unless it  is exported, under regulations prescribed
by  such Secretary, within  ninety days of the  date of notice of
such refusal or such additional time as may be permitted pursuant
to such  regulations, except that disposition  in accordance with
the customs laws may
not be made in such manner as may result, directly or indirectly,
in the sale, to the ultimate consumer, of a new  motor vehicle or
new motor  vehicle engine  that fails  to comply  with applicable
standards of the Administrator under this part.
(3)  A new motor vehicle  or new motor  vehicle engine intended
solely for export, and so labeled or tagged on the outside of the
container and on the  vehicle or engine itself, shall  be subject
to the provisions of  subsection (a), except that if  the country
which is to receive such vehicle or engine has emission standards
which  differ from  the standards  prescribed under  section 202,
then  such vehicle or engine  shall comply with  the standards of
such country which is to receive such vehicle or engine.
[42 U.S.C. 7522]