All depends on where the leak is at, keep in mind that the exhaust is a emissions part, and in most cases is covered outside your normal bumper to bumper warranty, and can be covered as much as 7 years or 75k, or more, depending on the maker. I HIGHLY suggest you whip out your owners manual and read it.
MOST people do not know that there are still warranties left past your bumper to bumper on alot of other parts, like paint, rust, emissions, restraints, and such, your owners manual should tell you what is still covered past B2B. But exhaust is a emissions part and the entire system should still be covered past normal BB, at least it is that way for Ford and Dodge, or was before 2000 when I was the service MGR for them.
OH and if the manual doesnt say or you dont have it, of course depending on the dealer they may tell you your out of luck, I would really check in on this. The dealership doesnt want you to know that you have a warranty after B2B and love it when people dont know these things and can charge you up the rear for the repairs that would of been covered. So look hard into it and call main HQ if you have to till you get a for sure 100% on what is covered past the B2B.
OH AND dont take it up the ass either, if they come back and say its due to road salt you tell them to pack it up their ass with sunshine because thats supposed to be stainless steel, it was to resist road salts, and hence the fvcking warranty in the first place
They give you crap call HQ on them, I promise you make a big enough stink on a covered part it will get taken care of, my customers used to do it all the time to me when I had to play hard ball till they finnaly made the call