catalytic replaced with 2 foot pipe?? help!!! - Chevy Impala Forums
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post #1 of (permalink) Old 02-26-2012, 09:10 PM Thread Starter
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catalytic replaced with 2 foot pipe?? help!!!

i got a 95 ss with bad cats and a buddy of mine said i could get them cut off and replaced (cut and weld) with a 2 foot pipe or get them gutted will this ruin anything mechanically?? what are the ups and downs of doing this??
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post #2 of (permalink) Old 02-26-2012, 09:47 PM
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Ups: Little to non, you will need to have the cats removed from your PCM


Wont pass emissions
Exhaust will occasionally stink
Violation of Federal Law

Honestly you come off in the better end of simply replacing them with new ones. And this is coming from a person that does not have cats as well. Not by choice, last owner cut them off for some reason. No since in gutting them, cause they will sound like crap.

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post #3 of (permalink) Old 02-27-2012, 05:44 AM
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To add to above a few have even lost mpg's by removing them. A good friend of mine lost 3 mpg by removing his and his truck did not get that good before the removal. Older cars it did not matter and IMO on carburetor cars I think they are a waste.

If your cats are plugged you need to make sure you are not having misfires and that you are not dumping raw fuel into the exhaust system.

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post #4 of (permalink) Old 02-28-2012, 03:17 PM
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Also if you are burning any oil, that would be another cause.

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post #5 of (permalink) Old 03-01-2012, 09:38 AM
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There's also no power gain in our cars when removing the cats (on a stock system). Tests have shown the only significant difference it will make is in the sound.

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