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Difference in single cat and dual cat header/y pipe

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Old Apr 3, 2008 | 07:12 PM
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Difference in single cat and dual cat header/y pipe

i have a 97 ss with shorties on it now with the stock y pipe and gutted cats. I bought a set of longtubes for it but they are for a 95 single cat.... what am i gonna have to do about the y pipe? whats the difference?
Old Apr 3, 2008 | 07:21 PM
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Originally Posted by stockssn2o
i have a 97 ss with shorties on it now with the stock y pipe and gutted cats. I bought a set of longtubes for it but they are for a 95 single cat.... what am i gonna have to do about the y pipe? whats the difference?
It doesn't matter if you have a stock single cat y-pipe or a stock dual-cat y-pipe, neither of them will work with long tube headers due to the dimensions. What brand long tubes did you buy?
Old Apr 3, 2008 | 07:22 PM
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Originally Posted by 2000GTP
It doesn't matter if you have a stock single cat y-pipe or a stock dual-cat y-pipe, neither of them will work with long tube headers due to the dimensions. What brand long tubes did you buy?
they are jet hot... i have a y pipe in 5 pieces ... i just wanna know the difference in the two ...
Old Apr 3, 2008 | 07:24 PM
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Originally Posted by stockssn2o
they are jet hot... i have a y pipe in pieces ... is it gonna bolt up or what ...
If it is the jet-hot long tube header y-pipe then it will bolt up. If it is a stock y-pipe, it will not.
Old Apr 3, 2008 | 09:01 PM
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i did a search the AIR fitting is different and the 97 has rear o2 sensors...which isn't a problem because the rear o2s are turned off on my car
Old Apr 4, 2008 | 06:58 AM
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If they are the "race" headers, it won't be an issue considering they won't have the AIR and EGR fittings.
Old Apr 4, 2008 | 10:48 AM
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I just got an ORY pipe for my 97.

BTW, how did you turn off your rear o2 sensers ?
Old Apr 4, 2008 | 11:27 AM
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The rear sensors have to be eliminated in the PCM programming. Or replace them with "sims", if anyone is still making them.
Old Apr 4, 2008 | 01:35 PM
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Originally Posted by 2000GTP
If they are the "race" headers, it won't be an issue considering they won't have the AIR and EGR fittings.
they aren't race headers they are emmisions legal

Originally Posted by LJM97Z
I just got an ORY pipe for my 97.

BTW, how did you turn off your rear o2 sensers ?
we turned them off when i got it dyno-tuned...
Old Apr 4, 2008 | 02:10 PM
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96-97 cars have different AIR fittings than previous years. And if you're going with an ORY and already had the rear O2s deleted, then y-pipe doesn't matter, as long as it bolts up to your catback.
Old Apr 4, 2008 | 05:44 PM
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Originally Posted by Injuneer
The rear sensors have to be eliminated in the PCM programming. Or replace them with "sims", if anyone is still making them.
They are alot harder to find, although I know of a couple of vendors in which I purchased a couple sets from to keep on hand. If you are interested in the links for your own personal reference, I can PM you them.
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