catalytic converter 5.2 ram

I noticed a rattling noise when my wife drove her truck today,Thought the transmission was going out.As she was driving today she said it ran but would only go about 15 m.p.h.When i got home from work tonight i started the truck and noticed the flowmaster exhaust was restricted,Found it to be the catalytic converter was collapsed.This converter has been on the truck for about 2 years.I was just wondering if anyone knows anything about aftermarket converters.I paid $200.00 for this one and at the dealership they are $600.00.Need to fix it tomorrow. :mad: