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Does anyone know of any CARB approved OBD II Catalytic Converters that will function better than the stock ones? I saw on the ARB web page thw Walker Manufacturing Company got approval for the Crown Vics, 3.8L Mustangs, Town Car and Grand Marquis. However, there is no mention of the 4.6 Mustangs or the 4.6 T-Birds or Cougars. The approval was for a Three-Way Catalytic Converter Series 200200 for the front and a Three-Way Catalytic Converter Series 200300 for the rear. However, I can't find these cats anywhere on Walker or Dynoflow's website. Has anyone heard of this at all?

Please advise, my cats are 8 years old and I would like to get them replaced since they have 80,000 miles on them and meet the CA requirements for replacement.
 
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