I need to replace my exhaust . Thinking about going straight pipe. Do I leave the resonator on, or take it off and connect to the catalytic converter? Also, should I replace the decade old catalytic converter with 230k miles? Same question about the resonator if I leave it on.

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05 CRD Sport, Inferno Red (240K miles, Jan 2016)
Westin Brush Guard, Hella 500, Hidden Hitch
Magflow Muffler, ProVent CCV, Fumoto Valve, ORM
OEM Skids and Rails, EVIC, Mr Diesel Fuel Pump
Michelin XTerrains 235/70/16

You don't have to have the catalytic converter been running mine without one for about 70 75,000 miles it does make it a little louder also running the magna flow muffler but there's many that just straight pipe it no muffler no catalytic converter your choice personally I would recommend taking the catalytic converter off and leaving it off it just accumulates a bunch of sut and create more back pressure than what you need mine runs much better once I took it off more power little better mileage