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Cat / Y pipe question

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Old Nov 9, 2009 | 07:37 PM
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Default Cat / Y pipe question

Will a 2002 Stock cats / Y pipe work on a 99 T /a with factory manifolds?

Basically what I am asking are the 98-99 Manifolds able to bolt up with a 2002 and up factory cat / y pipe set up?

Thanks
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Old Nov 9, 2009 | 08:33 PM
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they will yes...but i think the emmisions are diff
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Old Nov 9, 2009 | 09:53 PM
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Ok, i was just making sure they would bolt up, i know the cat setups are different, but I will just make changes to the computer tune to adjust i guess.

thanks for the info
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Old Nov 10, 2009 | 08:40 PM
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Originally Posted by casey38boost
Ok, i was just making sure they would bolt up, i know the cat setups are different, but I will just make changes to the computer tune to adjust i guess.

thanks for the info
they will because iv done it before so i know
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Old Nov 10, 2009 | 10:13 PM
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What are the differences? I was looking to get a used set of shorty headers or the later 2000 -2002 manifolds for my car but I am wondering what the differences are. If the manifolds will bolt right up thats perfect. I am guessing juts the EGR is the difference?
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Old Nov 11, 2009 | 08:49 AM
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as far as i know its just egr but you can junk that
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Old Nov 12, 2009 | 07:16 PM
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Originally Posted by senicalj4579
as far as i know its just egr but you can junk that
Thanks!
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Old Nov 14, 2009 | 07:17 AM
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Are you sure about that Senical? The manifold on the passenger side of the 98-99 seems to turn down and out behind the #8 spark plug. On the 00-02 the turndown is further forward, between cyls 6 and 8. This is why the people with the later set-ups find it easier to access the number 8 plug from the bottom of the car.

As far as the drivers side, it will come dawn in the same location and actually uses the same cat through all of the LS1 model years.

On the 98-99 cars the cat is built into the Y pipe and located under the pasenger floor.

On the 00-02 cars the starboard side cat is mounted right at the end of the manifold much like the drivers side.
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Old Nov 14, 2009 | 08:56 AM
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yea as SVThis said the emmisions set up is diff. but yea they will work.
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Old Nov 14, 2009 | 09:15 AM
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Originally Posted by Fireberg
Are you sure about that Senical? The manifold on the passenger side of the 98-99 seems to turn down and out behind the #8 spark plug. On the 00-02 the turndown is further forward, between cyls 6 and 8. This is why the people with the later set-ups find it easier to access the number 8 plug from the bottom of the car.

As far as the drivers side, it will come dawn in the same location and actually uses the same cat through all of the LS1 model years.

On the 98-99 cars the cat is built into the Y pipe and located under the pasenger floor.

On the 00-02 cars the starboard side cat is mounted right at the end of the manifold much like the drivers side.
my ls1 before i have now was a 98 z28. i installed full exhaust. longtubes to catback. a couple years ago i had to sell the car. i took off all the aftermarket stuff including the whole exhaust ect. i bought a y pipe from a guy on here from a 01-02 car. I reused my manifolds from my 98.bolted up the ypipe from the 01-02 and just left the magnaflow catback on there. i needed just the y pipe because i trashed it when i did my header install in 06. i didnt have any problems so thats why i think it will work. but hey who knows?
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