Quote:
Originally Posted by ProCharger
As he said, o2 simulators would work. Lots of tuners use them when they remove the cat's and want to keep from throwing a code. Basically what it does is sends a false signal to the vehicle saying all things are good. I haven't looked at the exhaust very closely on our trucks but if there are no pre-cat o2 sensors this option should be avoided as there would be no data for the trucks fuel trim besides what the dummy sensor is sending which would be nothing realtime. You still need pre-cat o2's either way.
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We have two sets of cats on these trucks. If I remember correctly, the O2 sensors are behind the first set of cats, not the second set.
I don't see a problem (i.e. throwing codes) from removing the last set of cats. However, as others have mentioned, you may not pass a smog test . . . visual and/or the sniffer test.