Cat to exhaust question
 

Bolts holding rear exhaust to catalytic converter (or maybe a resonator? didn't think they used them anymore) gave out today, and I was wondering if there is supposed to be a gasket between the two flanges there before I go connecting everything back. Another question, are those buggers threaded in there? Pardon my ignorance mates, not much experience on Hondas. All parts are stock 01 Accord 4cyl. coupe.