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#17209 - 05/13/02 03:29 PM Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
I am wanting to buy an offroad pipe for my 2000 GT. I am probably going to buy the one from GP store but I read something about it needing an O2 simulator? So i went and read about the O2 simulator and it said only for the supercharged gp's. I need some more info on this. since I have a GT will i need this or if so will that O2 simulator work for a GT?
Also does that off road pipe from GPstore bolt right in and does it do away with the ubend? basically is their any welding required?
thanks
_________________________
-Phil C.
Black 2000 GrandPrix GT
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#17210 - 05/13/02 03:43 PM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
I believe it is a flange to flange replacement. It will replace your CAT and UBEND at the same time. Best to ask the grandprixstore, but I am almost 100% sure of this.

AS for the O2 Simulator, I thought it was for the GTP and GT engine as well. I'll try to find more information on this..
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#17211 - 05/13/02 06:43 PM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
ok thanks let me know what you find
smile
_________________________
-Phil C.
Black 2000 GrandPrix GT
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#17212 - 05/14/02 12:55 PM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
Phil, the O2 simulator should work for the L36 engine..this is from Zoomer's mouth from www.zzperformance.com
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#17213 - 05/14/02 01:14 PM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
Hey after emailing grandprix.net and getting confused here is our whole convo. Now does all this sound right?
---------start of thread-----------------------
Hello,

I would recommend getting the high flow cat with the 2.5" outlet. You are
not really gaining that much more by removing the cat compared to a high
flow cat setup.

If you get the off road pipe (straight pipe), you should not be hooking it
up to the stock exhaust system. There typically is nothing behind it. Most
people do this for track use.

Best Regards,
Eric Wong
PFYC - http://www.partsforyourcar.com/
[ *** NOTE: Please include this message when replying *** ]

----- Original Message -----
From: "CHAPMAN, PHIL BRIAN"
To: "'Eric Wong'"
Sent: Monday, May 13, 2002 7:54 PM
Subject: RE: Off road pipe

> yea i want to do away with the cat all together. a muffler shop will not
> remove the cat because its illegal. and I thought the offroad pipe was AKA
a
> straight pipe. im a little confused please email me back
> thanks
> Phil
>
> -----Original Message-----
> From: Eric Wong [mailto:ericwong@grandprixstore.com]
> Sent: Monday, May 13, 2002 7:50 PM
> To: CHAPMAN, PHIL BRIAN
> Cc: pfyc
> Subject: Re: Off road pipe
>
>
> Hello,
>
> The exhaust flow would be all messed up because it will be a 3" pipe
bolting
> onto a 2.5" pipe.
>
> If you are looking to remove the cat, I am guessing you could try a local
> muffler shop to remove it for you and replace it with a straight pipe.
>
> Best Regards,
> Eric Wong
> PFYC - http://www.partsforyourcar.com/
> [ *** NOTE: Please include this message when replying *** ]
>
>
> ----- Original Message -----
> From: "CHAPMAN, PHIL BRIAN"
> To: "'Eric Wong'"
> Sent: Monday, May 13, 2002 6:59 PM
> Subject: RE: Off road pipe
>
>
> > nah Id ont want anyting street legal. illegal is my middle name lol just
> > kidding :-) Right now I just have the stock exhaust sytem on there. so I
> was
> > gonna get the off road pipe and take the cat off. so what would I need
to
> do
> > if I am currently using my stock exhaust and decide to buy the off road
> > pipes?
> > -thanks
> > Phil
> >
> > -----Original Message-----
> > From: Eric Wong [mailto:ericwong@grandprixstore.com]
> > Sent: Monday, May 13, 2002 6:52 PM
> > To: CHAPMAN, PHIL BRIAN
> > Cc: pfyc
> > Subject: Re: Off road pipe
> >
> >
> > Hello,
> >
> > The off road pipe is not meant to work with an exhaust system unless you
> > have a 3" system in place. It is meant to be run just by itself. It
does
> > replace the U-bend portion.
> >
> > If you want a more streetable application, I would suggest the high flow
> > converter.
> >
> > Best Regards,
> > Eric Wong
> > PFYC - http://www.partsforyourcar.com/
> > [ *** NOTE: Please include this message when replying *** ]
> >
> >
> > ----- Original Message -----
> > From: "CHAPMAN, PHIL BRIAN"
> > To: "'Eric Wong'"
> > Sent: Monday, May 13, 2002 6:44 PM
> > Subject: RE: Off road pipe
> >
> >
> > > ok so the O2 simulator would work for my GT then? and does that off
road
> > > pipe also replace the ubend?
> > > thanks
> > > -Phil
> > >
> > > -----Original Message-----
> > > From: Eric Wong [mailto:ericwong@grandprixstore.com]
> > > Sent: Monday, May 13, 2002 6:06 PM
> > > To: CHAPMAN, PHIL BRIAN
> > > Cc: pfyc
> > > Subject: Re: Off road pipe
> > >
> > >
> > > Hello,
> > >
> > > It will work on both the GT and GTP. Thanks.
> > >
> > > Best Regards,
> > > Eric Wong
> > > PFYC - http://www.partsforyourcar.com/
> > > [ *** NOTE: Please include this message when replying *** ]
> > >
> > >
> > > ----- Original Message -----
> > > From: "CHAPMAN, PHIL BRIAN"
> > > To:
> > > Sent: Monday, May 13, 2002 4:27 PM
> > > Subject: Off road pipe
> > >
> > >
> > > > I have a 2000 GP GT and I want to put me an off road pipe on it. Now
i
> > was
> > > > reading the description of your offrode pipe and it said something
> about
> > > an
> > > > O2 simulator or soemthing. So i went and checked out the O2
simulator
> > and
> > > it
> > > > said only for supercharged gp's. Since my car is a GT do i need this
> O2
> > > > simulator thing?
> > > > just need some more info.
> > > > thanks
> > > > Phil
_________________________
-Phil C.
Black 2000 GrandPrix GT
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#17214 - 05/14/02 05:56 PM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
Phil,

From the product description, I would say my understanding of the offroad pipe is a little hazed. I was under the impression the offroad pipe was 2.5 in diameter (flange to flange).

From your correspondance with the Grand Prix store, it seems that it may be a 3.0" pipe and in that case, it will NOT be a direct bolt-on to your stock exhaust system.

From their webpage:

Quote:
Two part numbers to choose from. One bolts up to the stock down pipe, the other bolts up to the down pipe of headers.
Their description would imply it would be a 2.5" diameter pipe.

The product description could be old or wrong. If the Grand Prix Store says it wont fit, then I would listen to them.

Perhaps someone who has bought the Offroad pipe can offer some advice?
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EYE HAM DA REEL SLIM SHADY
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#17215 - 05/14/02 11:55 PM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
Yea im really confused about the whole situation. if anyone out there can help please do so. we need feedback here! [Rotate]
i will try and email grandprix store back if nto maybe you could email them
_________________________
-Phil C.
Black 2000 GrandPrix GT
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#17216 - 05/15/02 07:48 AM Re: Off road pipe ?
vortec4200 Offline
Member
Registered: 05/02/02
Posts: 136
Loc: Sterling Heights, MI
One thing about the off road vs. high flow cat is you lose 'tuning' on the exhaust with the off road pipe. Air pressure waves bounce off the surface of the cat and actually help 'suck' more exhaust out of the cylinders, effectively increasing airflow (=more power!). This is best at low speed. At high speed, the cat restricts the airflow, so you'd be better off with the off road pipe in this case. So it's a trade off.

Let me know if I wasn't very clear, I'll try to explain better if this didn't make sense.

EDIT: I realize you guys are talking about what bolts to what, I don't really know about that stuff though. Just thought I'd throw in my .02 - the off road pipe isn't necessarily as good as you might think.
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#17217 - 05/15/02 09:35 AM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
Phil,

I did a little more research and it appears the offroad pipe is indeed 3.0 in diameter (as stated in your emails with Eric Wong of GPS). This will not bolt on nicely with your stock exhaust system.

If you get a 3.0" diamater-piped exhaust system in the future, then you could use the offroad pipe.

Else, as stated by Eric, you could use the offroad pipe as a TRACK MOD only- meaning attach one end of the offroad pipe (closest to engine) and leave the other end OPEN and hanging. (closest to rear of car)

Vortec also brings up some good points about the offroad pipe vs high flow cat. I dont think the GT wants to lose any more low end power if possible.
_________________________
EYE HAM DA REEL SLIM SHADY
http://www.mrquija.net
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#17218 - 05/15/02 01:08 PM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
So your sayin i should buy the high flow cat? I just heard the cat restricts a lot. Will the highflow cat affect emmissions?
Id ont know what to do. what would be best for a stock 2000 GP with a Thrasher CAI TBI?
thanks confused
_________________________
-Phil C.
Black 2000 GrandPrix GT
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#17219 - 05/15/02 03:25 PM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
If you are running out of breath at the top end, then I would suggest an offroad pipe. But then again, you would have upgraded your exhaust by this point.

If all you have is a Thrasher CAI and you've decided to blow money on either an offroad pipe or a high flow cat, I would buy the high flow cat. The high flow cat should not affect your emissions.

In my opinion, you'd be better off doing other things with the $$ than blowing it on a high flow cat or offroad pipe. Neither are a good bang for the buck kind of mod...especially when your engine is pretty stock.
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EYE HAM DA REEL SLIM SHADY
http://www.mrquija.net
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#17220 - 05/15/02 03:27 PM Re: Off road pipe ?
vortec4200 Offline
Member
Registered: 05/02/02
Posts: 136
Loc: Sterling Heights, MI
I see you're in Louisville. Does Kentucky do emissions testing? If so, then the off-road pipe is not a good idea, unless you don't mind swapping it for your stock one for when you do the testing. You won't pass emissions testing with the off-road pipe. You probably will pass with the high flow cat.

To summarize my earlier post, the off-road pipe vs. high flow cat is a tradeoff.

Off-road pipe: lose low speed power, gain high speed power. Also, not emissions legal.
High flow cat: no change in low speed power (I think), gain high speed power (but not as much of a gain as the off road pipe). Probably emissions legal.
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#17221 - 05/15/02 03:56 PM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
So what is the best bang for the buck then? I am clue less on what to do. Should I just forget the off road high cat idea and just go to my local muffler shop and have them custom made me an exhaust?
very confused at this point confused
_________________________
-Phil C.
Black 2000 GrandPrix GT
Top
#17222 - 05/16/02 07:29 AM Re: Off road pipe ?
MrQuija Offline
Moderator
Registered: 05/01/02
Posts: 52
Loc: Derwood, MD
_________________________
EYE HAM DA REEL SLIM SHADY
http://www.mrquija.net
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#17223 - 05/16/02 08:13 AM Re: Off road pipe ?
Phil C. Offline
Member
Registered: 05/05/02
Posts: 65
Loc: Louisville
well im talking for Horsepower. Thats what I want is better performance and more power. So is that what you suggest? Give me some more info I always thought exhaust was the first thing you start with. thanks for the ideas though! [Rotate]
_________________________
-Phil C.
Black 2000 GrandPrix GT
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