ok my gaskets are new and completely sealed, no visible or leaks that i can feel, but can still hear a very loud leak when accelerating. The gaskets were done by the stealership and checked over since I could stear hear the hiss. Any other guesses where this leak could be coming from, possibly cracks in manifolds?

Also, the welds were also double checked over by the same muffler shop that did my exhaust while i was under the truck with them looking. This is pissing me off!!

Chris