A plugged CAT will drop your mileage, but they are expensive, and are under a 10year 120k warranty. If you are out of warranty, an exhaust back pressure test can be done with a guage in one of the 02 sensor bungs to determine if it is plugged.
No I had a clogged cat and it was too expensive for me to replace at the time, I currently am not running a cat.... I feel that my mileage got worse after removing it, i mean my transmission is taking a turn for the worse now, but I am asking if i added a cat, now that i can run a universal since my Tune, would my mileage be better? Tune is not for a catless setup.
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