Got my exhaust installed and I love it, but right where the cat (high-flow cat from them) connects to the cat-back I cannot for the life of me get it to stop leaking. I had a mechanic friend help me install everything and I didn't seem to have any leaks anywhere else. We cranked down real hard on the clamp, then we loosened it up and moved it around a bit and rotated it and clamped it down tighter. Still leaking. So a couple days later I got under there and again loosened it and reclamped it. Still leaking. Same thing today, twice, and still leaking both times. Anyone else have this problem? Am I just not clamping it down enough?