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Old 04-22-2016, 10:34 PM   #1
bigolrig
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Member#: 185347
Join Date: Jul 2008
Chapter/Region: MWSOC
Location: Lexington, OH
Vehicle:
2002 EVO3 bugeye wag
EG33 Swapped 2 dr RS

Default Clogged cat replacement

So my brother has an 05 outback which is all stock. It has a clogged cat and he doesn't have much money to fix it. Can I weld in any cat or does it have to be exactly the one that came on the car? I am not well educated on cats and the emission systems. I have my old stock wrx exhaust, if it fit could i just weld that cat it in? One off another NA subaru?

Thanks!
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Old 04-23-2016, 01:17 PM   #2
blue wrench
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You can weld in or replace the pipe with any cat. really, but with anything other than stock you'll always be taking the chance of catalyst efficiency/lean/rich codes popping up.

If your state doesn't do state inspections you could weld in a piece of pipe and live with the CEL if you really wanted to just the car up and running.
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Old 04-23-2016, 05:11 PM   #3
EdHilario
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You can replace it with any cat so long as it doesn't throw you a P0420 code which it tends to do with a high flow cat (although there are ways around this).
If you have an OE replacement from another Subaru, go for it.
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Old Yesterday, 03:04 PM   #4
bigolrig
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2002 EVO3 bugeye wag
EG33 Swapped 2 dr RS

Default

yeah i would like to avoid a cel so if anything does pop up i know about it. could i just weld in a pipe and do the 02 sensor elbow cheater? my one idea was to go cut one off at the pull a part. they have a few foresters
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