Anybody used one of these? https://www.amazon.com/Walker-33975-Aluminized-Lap-Joint-Exhaust/dp/B0015KUF5Y On the Rat, I have adapted the Y pipe/cat connection to accept a 2 1/2" universal cat. I can't get a tight clamp on the piece of pipe at the 2 1/2' ID to 2 1/2 OD adapter even though the pipe butts up to the Y pipe inside the adapter. The weight of the cat,intermediate pipe and muffler are enough to so I can rotate the entire exhaust by turning the oval muffler. I'm using regular 2 1/2 exhaust clamps. I'll shear it before I can get enough of a squeeze.