IIRC, you will need a really big cresent wrench. Obviously a socket won't work. I used a really big pair of pliers because I didn't have the right size wrench. Also, you will need to move the heat shield out of the way. Big pain to remove it completely--just loosen it and move it out of the way. It's an easy and obvious repair. You might put a little anti-seize on the threads.