Changing Cat Converter

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04-15-2018, 04:01 PM

TheZR2ThatCould

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Changing Cat Converter

I have a 2000 Blazer (4wd 2d), and recently my cat clogged up to the point where it served as a rev limiter allowing me to go about 10mph tops. Unplugged an 02 Sensor and whoopdy doo, that cleared it up, and in no time im going 60 again. However this is not a fix, as it is against the law. My goal is to take the cat converter portion of the exhaust off and replace it leaving O2 sensors unharmed; however I dont know my years pipe sizes for input/output of the catyl. Converter. Anyone know for sure?

04-15-2018, 06:22 PM

Tom A

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I just replaced mine with a Walker 81923 from Summit (California legal, not that it matters to you) from Summit. It was 2-1/2" in and out.

Last edited by Tom A; 04-17-2018 at 10:41 AM.

04-15-2018, 07:03 PM

newguy

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04-17-2018, 10:29 AM

LesMyer

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Unless you do a trick to slow down the response of the post-cat O2 sensor, the SES light will come on without the cat converter. That is the sole purpose of the post-cat O2 sensor - to make sure the cat converter is working properly. It compares O2 signals before and after the cat converter. With a straight pipe (also against the law), that will be the same.