where's the hole? if it's at a straightish portion of the pipe, use a coke can and some hose clamps to bandaid it.
if not, you can try using some real hi-temp jb weld.
i had the same issue, i think it was from runnin the g3 reeds w/ the stock pipe.....had a small leak at the first bend and i used some jb weld and good to go! of course, i've installed an f7 since then.