04 titan 2wd leaking exhaust?

Hello. I stumbled upon a deal on a 04 titan 2wd. probably should have known better. it has an exhaust leak and the check engine light on. it sounds like possibly a crack manifold from some quick googling and sounds like a PITA. it does have 78k miles and i saw something about a possible 80k or 100k extended warranty on the manifolds though. 2004 was 13 years ago would i have any luck at a dealer? what would be my best option? other than changing oil i'm not very auto savvy so doing this myself is pretty much out of the question. thanks