Stupid question: I picked up a pair of Agostini slip-one lightly used to try before I go full GTM setup. But I’m stuck at this point: cans are tight on the pipe going into what I assume is the cat. The braided section moves and twists whenever I try to apply any force to the stock muffler to try to loosen it for removal. The clamp is loose already (I ain’t THAT stupid). Any ideas? Is there something I’m missing?