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Message: <blockquote data-quote="PoManNox" data-source="post: 24580" data-attributes="member: 8300">I could see the potential of a clogged catalytic converter being a possible cause of an underboost code.How long have you had the $125 aftermarket catalytic converter in place?   Just curious how long it will last before it throws catalyst inefficiency codes.   I couldn't even buy one of them if I wanted to in the People's Republic of NY being a CARB state.  The only way is to hope you have a friend or relative in a non-CARB state mail order it for you and then get it from them.</blockquote>