On my car 4 of the 5 connections would need to be sealed up. The only one that doesn't leak is the one that connects the over axle to the tailpipes. They're very easy to access as three are on the intermediate pipe, and one is on the tailpipe. The tips are also clamped on, but I'm focused on the leaks right now.
Would something like this be effective?
http://www.permatex.com/products/aut...ipe_Sealer.htm