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If your car has the original exhaust then the cat. will be bolted directly to the exhaust manifold and the oxygen sensor will be in the exhaust manifold. As far as mileage to expect my vx (with mpguino and lean burn monitor ) gets 56 mpg at a true 60 mph on a flat road with no wind. If I see more than that then I have a tailwind . Even a slight wind will make a difference.
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