Upon closer inspection, my exhaust appears to be leaking somewhere inside the plates that enclose the exhaust. There are a series of these plates that sandwich the exhaust and it is leaking where the two pipes come back into one. Is this bad news? it looks like the pipe goes all the way from the cast iron manifold to the catalytic convetor. Please tell me it isn't so! Any ideas where to get the best deal on a new one? Thanks! Thom