I also want to say thank you for this write up. I found Perrin's instructions and your's very helpful for my install. A couple things I would like to add however. Jacking up the engine is not needed, you can twist the stock up-pipe and pull it over the frame. O2 sensor sockets are useless, or at least the one I got was. It kept twisting and getting the right torque on it was difficult. A 7/8" open end wrench is all you will need and is actually much more useful.