kny3twalker

iTrader: (31)

I recently bought some OEM catalytic converters only to discover that the '02 converters were different in shape than those on my '99. So my question is, if I were to get an '02 Y-Pipe, would the '02 converters and '02 Y-Pipe bolt up to my '99 manifolds without modification?
(Basically, I just need to know if the '02 and '99 manifolds are the same design.)
Thanks

2000***camaro***ss

iTrader: (3)

if im not mistaken i think they made a change in 2000. apparently the '00 through '02 manifolds flow a little better

senicalj4579

iTrader: (41)

yes they did. I know 01-02 have better flowing manifolds than 98-99 but idk if they introduced the better manifold in 00 or what

And Im not positive but I thing they may bolt up. I think I bolted in a y pipe from a 01 into my 98 before i sold it I cant remember though

Bottom line is 99 is not the same as 02.

HotSilverBird

The early manifolds are tubular design, the newer are cast iron. They completely changed the cat postitions and pipes. You will need the pipes with the cats.

kny3twalker

iTrader: (31)

I want to thank everyone for their replies.

I am though still confused as to whether the '02 converters and '02 Y-Pipe (SLP Y-Pipe from link below) will bolt to my '99 manifolds and cat-back exhaust.

I do understand from the replies that the design has changed, but does this mean the flanges on the manifolds are different/located in a different position ('99 vs. '02)?

This is the Y-Pipe I am considering (in addition to the OEM '02 converters):
Y-Pipe, Larger Diameter 1998-02 LS1 Camaro/Firebird Replacement

SLP did tell me that the OEM converters and their Y-Pipe will work as long as the manifold flange has not changed positions.



Thanks

kny3twalker

iTrader: (31)

I found some images of a '99 manifold and '02 manifold if this will help.

'99 manifold


'02 manifold


Here are pictures of the converters I bought




Thanks

senicalj4579

iTrader: (41)

Yea I just checked what I did 4 years ago on the 98 and it looks like I bought 01-02 manifolds along with that year y pipe (cats) and installed them that way.

So it may be cheaper for you to just get some used 01-02 manifolds like I did. If I knew I wouldnt be needing the 01 system I took off my car I would sell it to you.

I say get some used 01-02 manifolds + the y pipe your looking at. Or just sent those cats back and do something else.

Whats the reason your changing these cats?

98TAjwh

iTrader: (4)

i think the headers on the 00+ models are angled differently than the 98-99. i remember i tried to switch the cats and y from my 98 to 00 cats and y and the 00 cat on the passenger side would not fit because it hit the floor board. the driver side is a direct match but not the passenger. you'll have to get the 00+ headers to make it work IIRC.

senicalj4579

iTrader: (41)

Make a long story short no it dosent look like your 98-99 manifolds are gonna work. They will bolt up cause the bolt paterns are the same but the passengerside 98-99 manifold is much longer that 01-02. Heres some pics....


01-02 is on the top. Look at how much longer the 98-99 is.

senicalj4579

iTrader: (41)

And here is drivers side. These look close but it looks like theres a little more kick in the 01-02. 01-02 is on the top..........

kny3twalker

iTrader: (31)

I am changing converters because my existing converters throw a code from time to time. I expected it to be much more simple though.

And I too worried that the manifolds maybe at different angles.

EDIT: which apparently is an issue.

Everyone thanks for the replies. If anyone maybe interested in the converters, I bought, let me know (the converters have about 500 miles on them and will include the O2 sensors, pictured). I also bought new flange gaskets (Fel Pro).

senicalj4579, Thanks again. I really appreciate the pictures.

Arc00TA

iTrader: (17)

Also 98 Has unique AIR and EGR fittings, different from 99-00, so your 98 hardware will not bolt to a 99+ manifold.

kny3twalker

iTrader: (31)

My car is a '99 as are the manifolds, but I appreciate the information. If I wanted to install the '02 manifolds, is there any else besides the manifolds, I would need?
Thanks

Arc00TA

iTrader: (17)

99 still has EGR so you will have to remove the EGR. They removed that in 01-02 like the vette's. That means you will need to cap the intake or use an LS6 intake assuming you still have the stock LS1 intake.