I would get it taken to the custom exhaust shop and have hem tighten the housing for a couple bucks. My family's Jeep Cherokee did that exact thing and the cat's housing body was just loosened. Catalytic Converters don't consist of many parts, the converter has the body, and inside the body is a type of filter consisitng of catalyst beads to filter exhaust atoms. A shop should tighten it as it may be a pain, but it doesn't take long at all. Hope this helps.
