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I put in a new high flow cat, glass pack, & tail-pipe and noticed about 1 mpg increase in gas mileage (I calculate my mileage with each fillup by dividing the miles driven by the gallons to fill it up).
Keep in mind that these numbers are probably with people ditching their old exhaust and old cats. It's like people who get a new carb and say it's so much better than their 22 year old original, un-rebuilt carb! :lecture: :laugh3: