Its not a leak, it's a clunk. Its coming from behind the piece that's wider than the rest of the exhaust. I'm guessing the cat. (foot long, and wider) the piping that comes out of it will hit a beam when going over speed bumps, pot holes, etc. Is there a way to tighten this up? Or is there something durable I can put between them to soften the blows? Thanks for the help.