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