Like the title says, what is it and do I need it? It's off a '98 Ford F150 XLT V6 2wd, 5 speed. It was on the single exhaust pipe just behind where the two cats merge about 1' back. It was welded to the clamp which was around the joint where two exhaust pipes interlocked. Basically it rusted, broke, and rattled like he!!. So I took it off for the time being. Going to weld the 2 pieces (joint) back together rather than use an exhaust clamp. Needed to know if I should attach this back on the pipe though?