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Cutting out catalytic converter- how to

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Cutting out catalytic converter- how to
Old January 13th, 2013, 04:53 PM   #1
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Cutting out catalytic converter- how to

I pulled my side skirts off today and i have a buddy with a mobile welding unit coming over to cut the cat out and weld in a piece of pipe. Any pointers from you guys? What's the pipe size? 02 sensor need to be relocated?
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Old January 13th, 2013, 05:13 PM   #2
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You only have 1 o2 on either side since it's OBD1, and they are each located in the exhaust manifolds. No need to move them. The stock pipe is 2.5 inches. It's a pretty straight forward procedure, just make sure to tack the new pipe in place then set your side skirt back on to make sure the exhaust is situated correctly in the skirt opening.
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Old January 13th, 2013, 06:36 PM   #3
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Will it throw a check engine code?
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Old January 13th, 2013, 06:40 PM   #4
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No, the ecm has no way of knowing they are gone. (ie no rear o2's)
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Old January 14th, 2013, 05:24 PM   #5
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not trying to rob this thread, but would a 98 gts throw a code (rear o2 sensor)
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Old January 14th, 2013, 06:10 PM   #6
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not trying to rob this thread, but would a 98 gts throw a code (rear o2 sensor)
Yes, it would. Your rear o2's are only there to monitor the condition of the catalyst. When you remove it, the ecm thinks the cats are toast and throws a P0420 code. There are a few ways to get around this, not too hard.
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Old January 14th, 2013, 07:55 PM   #7
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sounds scary, but tempting.
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Old January 14th, 2013, 10:41 PM   #8
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Not sure about anyone else, but I used a Lynx 4 Crosscut saw.
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Old January 15th, 2013, 05:39 PM   #9
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I used tec screws to hold the exhaust pipe in position, then installed side seal to make sure pipe was aligned properly, removed side seal and exhaust pipe from car welded pipe joint, removed screws welded up holes left by screws, replaced exhaust and side seals. If you tack weld pipes together and they are wrong you must grind the tacks off to make changes. Also if you are welding on the car you should disconnect your computer.
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Old January 16th, 2013, 09:46 AM   #10
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I removed the pipe at the header and did the welding off the car.
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Old January 19th, 2013, 02:08 PM   #11
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97 and 98 should not throw a code. I am running a catless 97. The 99 is where it became an issue. I am now running.a 98 PCM, Neither PCM ever threw a code. Even when I dynoed i would remove the OEM O2's and no code.

Quote:
Originally Posted by AndyMac View Post
Yes, it would. Your rear o2's are only there to monitor the condition of the catalyst. When you remove it, the ecm thinks the cats are toast and throws a P0420 code. There are a few ways to get around this, not too hard.

Last edited by Jack B; January 19th, 2013 at 02:16 PM.
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