IMHO there is little difference if any in fuel economy if the cat-con is absent or present in good shape. The O2 sensor is located before the cat-con, not after it, and therefore would read the same, cat or no. The only difference would be slightly less backpressure with the cat deleted, a non issue if stock mufflers are retained. Note that none of this applies to OBD2 cars, (1996-up) which have o2 sensors before and after the cat and much more programming to monitor cat-con efficiency. They will still run the same,but will set off the check-engine light. |
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