An O2 sensor is nothing more than a battery. It creates an electrical current based on the difference in oxygen levels in the exhaust versus the oxygen levels on outside of the exhaust. Less oxygen in the exhaust = more current = rich. More oxygen in the exhaust = less current = lean. The O2 does not care what is in front of it or behind it. All it does is measure the difference in oxygen!
From the 1990 Amendments to the clean air act, established in 1970.
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Another change involves tampering and misfueling. Such activities have always been discouraged, but were previously illegal only for commercial operations. “Backyard mechanics” now are also subject to stiff penalties for deliberate tampering.
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You see when somebody posts about tampering with a cat it can pose some serious dilemmas. For one its illegal! Its never a good idea to give advice for a potentially illegal activity, especially in a public forum!! We don't know if its for "off-road" or if you incorrectly typed in the year. All we know is that you stated it has an O2 and a cat that you want to remove!