2002 Ford F-250 Exhaust

The truck has the 5.4L gasser engine and when I bought the truck it had true dual exhaust installed with Magnaflow mufflers and the catalytic convertor was removed (very loud and "rappy"). I would like to put a catalytic convertor back on but would like to keep the true duals to improve performance. Should I install the stock convertor back onto the truck and run dual exhaust convertor back or mount 2 convertors to keep it true dual exhaust? Thanks.