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Showing content with the highest reputation on 01/29/23 in all areas
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valid reason, then.. The major difference is in the catalyst material itself, as ido said above... and would be related more to emissions, not fuel consumption. fwiw - slightly raising tire inflation will net you more in the way of fuel mileage than any cat would. I usually go with about halfway between recommended pressure (on the car's info tag) and max pressure listed on the tire.. and check it regularly..1 point
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Rear flange is rusted. The only performance gain I would bother with is increased gas mileage.1 point