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Showing content with the highest reputation on 01/29/23 in all areas

  1. 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..
  2. Rear flange is rusted. The only performance gain I would bother with is increased gas mileage.

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