Exhaust bolt questions???

Ok this is starting to pi$$ me off, my stock exhaust header keeps coming loose from the catlytic converter. Those three bolts won't stay tight for the life of me I have tryed almost everythign except welding the bastards on! Any of you guys have this problem?

go get some new bolts, i had the same problem, i just went and replaced them, it worked

LOCTITE 222 THREADLOCKER.....OR ^^^