Gimmick, I would say.
Search for reviews on it. See what people are saying.
Edited: With a correct tune, the rear O2 sensor shouldn't have any affect on gas mileage. If I'm wrong please correct.
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Gimmick, I would say.
Search for reviews on it. See what people are saying.
Edited: With a correct tune, the rear O2 sensor shouldn't have any affect on gas mileage. If I'm wrong please correct.
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