The first step of the installation involves removing the original muffler and tailpipe assembly. Although the tailpipe appears large (about 3 1/2 inches) at the end, it necks down over the rearend and is a restriction. The Banks tailpipe is 3 1/2 inches throughout. The stock system is clamped together, but it's necessary to heat the slip joints to ease removal without damaging the rest of the system. The factory clamps and hangers are reused with the new muffler assembly, and no cutting or welding is required. The catalytic converter has a tab that indexes a notch on the muffler, taking the guesswork out of proper positioning.