I was warming up my EVO tonight in the driveway and noticed that somewhere down my exhaust stream, like after the cat I have a suspected exhaust leak that sounds like hisssssss.....

when I rev the engine, the pitch varies... and i think its coming from the connection between the B-Pipe and the muffler connection....

is this possible??? I put new gaskets on, and maybe was thinking I need to use gaskets with some HI-Temp RTV copper silicone gasket maker