Glass pack on '93 f150?

You can go down to the local muffler shop and have them cut out the muffler and add in a glass pack, but I'd go with a Flowmaster or MagnaFlow. It'll sound better with a 6 cylinder. Leave the Catalytic Converter alone, as the muffler shop will tell you the same thing. You may be looking at a few hundred at the most for this. But you could price around a few shops to get estimates so you'll know for sure.