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on my 2001 2500 burb there are 2 big round coffee can looking things on my exhaust are they cats or resinators an can they be removed if there resinators?i'm looking to free up some exhaust pressure to get alittle better flow for even better gas milage. LOL i was told when a 3/4 or 1 ton truck they didn't put cats on any info on this ???? thanks johnny