Hey guys, sorry to ask again, but i got the y pipe off the manifolds and now i can't get it off the cat back. It is already connected to a flowmaster catback and i can't get it off. it looks like its rusted on. i've been trying a lot of wd-40/liquid wrench and torching it. Has anybody been in this problem? And how do i do i get the y-pipe off? thank you

