The cat doesnt do anything else other then emmisions. I personally would take it off. Are you sure you even have a cat on a 73?. I would head to baxters auto parts and buy some headers and flowmasters . buy 2 reducers with flanges, gaskets, some pipe a couple of pipe hangers and go to town. I have never got pulled over for excessive noise . I run headers, 50 series flowmasters with 2.5" pipe
