Catalytic converter - Page 2 - Chevy Impala SS Forum
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post #11 of 21 (permalink) Old 03-18-2019, 08:45 PM
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Bought one for a taurus we had, poorly made, didn't fit well.
Had to be modified or it would have torn into CV boot.
It was cheap and it showed.
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post #12 of 21 (permalink) Old 03-19-2019, 10:18 AM
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I just recently went through this here in CA. Back in 2006 when my 96 had about 50k miles I replaced the OEM cats with Catco cats mainly just to save the OEM's for a later date. In 2006 the CA laws were not as strict so I was able to order the non CA compliant Catco cats from Summit Racing.

Fast forward to now the Catco's were totally garbage with the catalysts inside falling apart and rattling inside the cases. I was surprised they were junk after only 50k miles of use, but as others have said they are poorly made. Btw, the Catco's look nothing like the OEM cats, so don't assume the smog techs won't notice the difference. Luckily I still had the OEM cats, so I threw them on with 4 new Denso 02's, new Autolite iridium plugs and Summit Racing plug wires. My 96 which now has 102k miles passed with readings that were similar to when it was new.

If I would have needed new cats the best option to save $ would be to buy some universal "weld in" CA approved Magnaflows. Just cut out the bad cats and weld in the new ones. Now you'll have new CA approved cats with the correct CARB stamp on them plus they'll be in the stock location using the factory tubing.

Steve

Black 1996 SS, lot's of mods

Last edited by killian96ss; 03-19-2019 at 10:24 AM. Reason: Added information
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post #13 of 21 (permalink) Old 03-21-2019, 12:54 PM
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......Btw, the Catco's look nothing like the OEM cats, so don't assume the smog techs won't notice the difference.....
You used the same direct replacement cats I listed above in Post #6?

KW

1996 BBB SS, 398ci Solid Roller LT4, TorqHead 24x Conversion


1995 DCM SS, LS3, V-max 90mm TB, Lingenfelter GT1-1 cam, Headman 1 7/8 LT Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.73 gears -- 479HP/434TQ @ the wheels (Daily Driver)


2014 Chevy SS; Low Lash Solid Roller 429ci LS3 -- 548HP/464TQ @ the wheels....

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post #14 of 21 (permalink) Old 03-21-2019, 04:45 PM
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Quote:
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......Btw, the Catco's look nothing like the OEM cats, so don't assume the smog techs won't notice the difference.....
You used the same direct replacement cats I listed above in Post #6?

KW
I think so, here's a pic of the cats I took off recently. The OEM's were shorter, wider, dark titanuim color, didn't have heat shields and didn't have the 02's installed on the cat body.

Steve
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post #15 of 21 (permalink) Old 03-21-2019, 05:45 PM
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IIRC, in CA a CAT must be within 3" of its stock location. Weld in is fine as long as it has a CARB# and for 96 (OBD2) the CAT needs that stamped on it and has to be the same diameter pipe as stock (2 1/4")

Back when I bought the MagnaFlo replacements I got the 2 1/2" ones (LT1 Vette cars) which was before the current code change.

\'96 BBB 383/T-56
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post #16 of 21 (permalink) Old 03-26-2019, 11:01 AM
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I also live in Cali & I just put in Walker cats on my 96 SS $300 each installed. I did it because cel was on but I don't have 2 smog it untill October.
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post #17 of 21 (permalink) Old 03-26-2019, 07:15 PM
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Replacement Cats

I put Walker cats on my 1996 SS. I do not know if they meet CARB standards, but they bolted on just fine and dandy.
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post #18 of 21 (permalink) Old 04-03-2019, 10:02 AM
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i also live in cali & i just put in walker cats on my 96 ss $300 each installed......
Ouch!

KW

1996 BBB SS, 398ci Solid Roller LT4, TorqHead 24x Conversion


1995 DCM SS, LS3, V-max 90mm TB, Lingenfelter GT1-1 cam, Headman 1 7/8 LT Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.73 gears -- 479HP/434TQ @ the wheels (Daily Driver)


2014 Chevy SS; Low Lash Solid Roller 429ci LS3 -- 548HP/464TQ @ the wheels....

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post #19 of 21 (permalink) Old 04-08-2019, 02:17 PM Thread Starter
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Well I finally decided to bite the bullet this morning, I ordered up a set of Magnaflow CAT 448184 and 448185 and also 4 new AC Delco AFS75 02 sensors. I found a place that offered 20% off on the CATS and no sales tax and free shipping.
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1996 DGGM Impala SS
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post #20 of 21 (permalink) Old 04-11-2019, 08:55 PM Thread Starter
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New Cat's arrived today as well as my new 02 sensors. I'm going to my buddy's shop Monday morning to install them. Going to swap out the driver side exhaust manifold also since I know the gasket has failed and I picked up a spare set of manifolds and resurfaced them already so it's just a quick swap. Going to also replace the knock sensor pigtail since I seen the insulation is completely gone from the wire due to heat from the last 23 years.

1996 DGGM Impala SS
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