Replacing cats
Thread Starter
Racer
Joined: May 2009
Posts: 253
Likes: 38
From: Austin Tx
Replacing cats
Need to replace the factory cats on my 2000 couple. I'd like to replace them with the orig style. The pipes are in good shape.
Can the orig style cats be bought new?
What are the pipes made of?
Can the pipes be welded with a MIG?
Can the orig style cats be bought new?
What are the pipes made of?
Can the pipes be welded with a MIG?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to find a good used MID PIPE (same part number as your midpipe) and replace the entire mid pipe. You will not find the same CATs anywhere.
Not many places will weld in used CATS. Its easier to find an entire use low milage midpipe.
There are three or four different midpipe configurations. SO,,,, make sure that you find the one that fits your model year/exhaust manifold configuration. Other wise, the manifold outlet and the mid pipe inlets will not line up.
If it were me, i would get some new high flow CATs and have a shop weld them in.
Not many places will weld in used CATS. Its easier to find an entire use low milage midpipe.
There are three or four different midpipe configurations. SO,,,, make sure that you find the one that fits your model year/exhaust manifold configuration. Other wise, the manifold outlet and the mid pipe inlets will not line up.
If it were me, i would get some new high flow CATs and have a shop weld them in.
Thread Starter
Racer
Joined: May 2009
Posts: 253
Likes: 38
From: Austin Tx
Great reply as usual Bill.
I can weld them in. Just the matter of getting the right ones. The mid-pipe option would definitely be easier, but shipping on a intact mid pipe assy would probably cost more than the mid-pipe. I'll try to find a decent mid-pipe locally first.
Guess I'll need to find out what years had the same part# mid-pipe as my 2000. Is there a good site to research that? Are the differences obvious looking at a pic?
I've seen where some have had trouble with the post-cat O2-sensors after installing high-flow cats. Not sure what issues were involved with those situations.
I can weld them in. Just the matter of getting the right ones. The mid-pipe option would definitely be easier, but shipping on a intact mid pipe assy would probably cost more than the mid-pipe. I'll try to find a decent mid-pipe locally first.
Guess I'll need to find out what years had the same part# mid-pipe as my 2000. Is there a good site to research that? Are the differences obvious looking at a pic?
I've seen where some have had trouble with the post-cat O2-sensors after installing high-flow cats. Not sure what issues were involved with those situations.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Just have a tuner tune out the post cat O2 sensors if the PCM complains.
All the post cat sensors do is tell the PCM that you have operational cats. Does NOT effect performance or emissions.
All the post cat sensors do is tell the PCM that you have operational cats. Does NOT effect performance or emissions.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
See if you can find a Vette or performance shop near by and see if they have any scrap / discarded c5 exhaust that they removed. When I go to Carlisle PA, there are mountains of them at the header booths!!!
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
Do not use any aftermarket cats, unless you have codes p0420&430 tuned out. Otherwise the light will go on and they will set. It's just a matter of time. I have seen it in as soon as 1,000 miles.
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