Catalytic Converter - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-13-2009, 09:46 AM   #1
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Question Catalytic Converter

hey guy my bonne needs a new catalytic converter and i was wondering what option would be better buying a new or getting a used one, let me know what u think

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Old 07-13-2009, 10:29 AM   #2
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Depends. If your planning on doing bigger mods in the future, as far as performance goes, u may wanna get a hi flow cat, but if your just looking to replace a stock part, hit up the dealer ship or a junk yard and try and get you a OEM replacement. Keep in mind tho which ever route you take a used cat will have sustained a lot of use in its life so you may wanna get a new one either way.
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Old 07-13-2009, 12:39 PM   #3
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Quote:
Originally Posted by 1st Bonne View Post
hey guy my bonne needs a new catalytic converter and i was wondering what option would be better buying a new or getting a used one, let me know what u think
How did you determine that you car needs a new cat?

OEM aftermarket cat'* are not the expensive. I would recommend going with a new rather than a used. With the used you don't know how much time you would have left before you would need to replace it.
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Old 07-16-2009, 09:13 PM   #4
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Used ones around here are illegal. I believe it is an EPA thing. Buy a new one. I got one shipped for under $80, a Magnaflow.
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Old 07-16-2009, 09:27 PM   #5
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What year is your car? magnaflow cats are fine until you hit 2000+
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Old 07-17-2009, 02:59 AM   #6
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if you dont have an aft o2 sensor and dont want to put a cat in put a straight pipe in
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Old 07-17-2009, 12:07 PM   #7
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Quote:
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How did you determine that you car needs a new cat?

.
I wonder the same thing. did a tech tell you you needed a new cat? fail smog? Tweaking o2 sensors? loss of performance? loss of exhaust flow? blow a hole through your muffler?

We wanna see if we can save you money.
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Old 07-18-2009, 02:02 PM   #8
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yea the guy at auto zone said that my catalytic converter was clogged
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Old 07-18-2009, 02:28 PM   #9
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How exactly did he determine the cat was clogged? If the engine starts to loose power at higher RPMs that could be a clogged cat. Remove the front O2 sensor and run the engine that way. If the cat is clogged this will let the exhaust out. It will however be rather loud.
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Old 07-18-2009, 03:20 PM   #10
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The guy at AZ probably read an 02 sensor code and gave him a one size fits all description.
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