Punched out cat
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CF Beginner
Joined: Oct 2009
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From: Pennsylvania
Punched out cat
me and a buddy of mine thought up the idea of punching out the cat in my silverado but im a little skeptical as to whether or not its actually a good idea. i was wondering if anyone had any input as to the pros and cons of doin it
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Professional Mechanic
Professional Mechanic
Joined: Nov 2008
Posts: 2,950
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From: Bowie, MD
If you punch out the cat the check engine light will come on with a PO420 code for cat efficiency. You will not be able to feel a difference in power anyways. Get a nice cat back kit and leave the converter. A engine needs some back pressure to perform properly.
CF Junior Member
Joined: May 2007
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I punched out the cat on my 95, I didn't notice any pros, the cons that I had was:
i see smoke now that the cat would catch and burn off, cold natured starts never had before, no improve mileage or performance, so don't do it.
i see smoke now that the cat would catch and burn off, cold natured starts never had before, no improve mileage or performance, so don't do it.
CF Monarch
Joined: Jul 2007
Posts: 5,891
Likes: 29
From: Princeton, NC, USA
Hi flow cats really don't make that much difference either. Got some on the Silverado that were slightly used at a dirt cheap price. (Found out that the muffler shop is making money off the platinum elements in the stock converters also...)
Anyway, punching them out is only a temporary solution for the problem of a clogged cat in vehicles that predate OBD.
Anyway, punching them out is only a temporary solution for the problem of a clogged cat in vehicles that predate OBD.
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ericnottelin
Silverado, Sierra & Fullsize Pick-ups
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Jul 2, 2012 10:03 PM
