2000 Dodge Caravan Replacing rear coolant lines

Engine Cooling problem
2000 Dodge Caravan 6 cyl Front Wheel Drive Automatic 105k miles

The rear coolant lines have rusted beyond repair and need to be replaced. I have removed the cowl cover and the wiper housing, disconnected all lines and removed the nuts securing it to the firewall and undercarriage. i cant seem to wiggle it out by way of the catalytic converter under the vehicle. does it come out from the top by removing the alternator and the bracket or does the catalytic converter have to be removed to get it out.