This is a conscience decision that only you can make. Any advice that anyone gives you one way can be argued just as hard the other way.
FWIW, I have some contacts in the USA who, using flanges, bolt on a cat to pass annual smog inspections, bolt on a straight thru pipe for track days, and the rest of the time run a second resonator for the quiet sounds for less attention from the Police and to be neighbour friendly in the apartment block they live when they drive in/out and work on the car.....crazy but that's the livestyle and choices they want to make.....