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what cats to replace?

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Old Mar 5, 2008 | 06:44 PM
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what cats to replace?
what cat can we replace the easiest without throwing any codes ( wanna replace with a test pipe) thanks.
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Old Mar 5, 2008 | 07:09 PM
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huh?

only main cat can be replaced with test pipe...other two are part of exhaust manifold and requires headers to remove
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Old Mar 6, 2008 | 03:17 PM
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thanks sooner. Will that throw any codes in case in sensors are affected? performance gains worth it?
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Old Mar 6, 2008 | 03:21 PM
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just a test pipe?

Originally Posted by hotstartup
Will that throw any codes in case in sensors are affected?
possibly
Originally Posted by hotstartup
performance gains worth it?
no
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Old Mar 6, 2008 | 03:48 PM
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if you replace a cat with a test pipe you will get codes without a doubt.
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Old Mar 6, 2008 | 04:06 PM
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Originally Posted by Darktide
if you replace a cat with a test pipe you will get codes without a doubt.
Wrong. Only fed spec because they have an o2 after the cat.
You can get an o2 simulator if you don't want a CEL.
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Old Mar 6, 2008 | 04:28 PM
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No gains to be had unless your cat converter was clogged, if so I'd just replace it with a high flow unit.
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Old Mar 6, 2008 | 05:00 PM
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now days, cats are not as restrictive as in the past so a test pipe does nothing.
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Old Mar 6, 2008 | 11:54 PM
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Originally Posted by soonerfan
now days, cats are not as restrictive as in the past so a test pipe does nothing.
Unless your turbo.
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Old Mar 7, 2008 | 08:45 AM
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Originally Posted by spdfreak
Unless your turbo.
which 99% of the people on here arent....
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Old Mar 7, 2008 | 09:39 AM
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Get rid of pre-cats via headers/ypipe, keep factory cat. Plenty of info about this topic already.
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Old Mar 7, 2008 | 11:39 AM
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Originally Posted by spdfreak
Wrong. Only fed spec because they have an o2 after the cat.
You can get an o2 simulator if you don't want a CEL.
The OP has a Cali spec, so this doesn’t even apply.
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Old Mar 20, 2008 | 10:02 AM
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I just gutted/hollowed my cat, i'm in Fla.(no emissions testing here). Used a sim, no code probs... and great results. More throttle response/hp, works great with my magna flow exhaust and ram air intake.
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Old Mar 20, 2008 | 12:04 PM
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Originally Posted by MaxdFactor
I just gutted/hollowed my cat, i'm in Fla.(no emissions testing here). Used a sim, no code probs... and great results. More throttle response/hp, works great with my magna flow exhaust and ram air intake.
Dyno & timeslips to prove the "hp gains" ?!
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