were going to need a better description of the location. maybe use a pen to point at where its coming from in a photograph.
not trying to be a jerk, but here's why:
2:cast iron headers
none of those materials will lend well to band aids, jb weld, epoxy, etc.
my assumption is one of:
1:exhaust gasket leak
2: vband loose, and or broken at the joint.
other options are actual cracked headers. and on a 13 year old car its possible.
could you explain more, what sounds is it making, why you think its leaking. does it smell like exhaust under the hood?