Hi Mike, Sharkey. We recently removed a set of ~fried~ cats off a 5-Steel. It was a firebomb waiting to happen. Clearly, the right bank can (muffler/cat) would glow red and achieve temperatures that would melt the paint and burn the car down simultaneously. At some point in it's life leaded fuel was added. Doesn't take very much. When warmed up, at idle it was breathing actual flames out the right bank pipes, I posted a vid on facebook. Using one of your available lifts at your Mike Anderson Auto Group Dealership, raise the vehicle & check to see all original conversion bits from Amerisport are still in place & functional. Call me tomorrow if you don't know what to look for I'll guide you through. You'll have to do some welding on the headers where fresh air was initially introduced, just block 'em off.
Now in answer your question, the 5-Steel we did recently we cut the glowing hot cans off & welded on a set of Pantera Performance mufflers. We use a lot of 'em, they sound great and are not expensive. See their facebook page. Put the originals in a box for safe keeping. You have a beautiful car by the way, soon to be the nicest out there. I know.