http://youtu.be/ci-imMujhSQ
http://youtu.be/QmklWcYKQYg
Here are a couple vids of my Berk HFCs, but with an Akrapovic exhaust. They were a pain in the a** to put in. I finally did some googling and found out that the easiest way to install/remove cats was by removing some of the intake piping, using a few extensions and an impact wrench, and went through the engine bay. After doing that, install was a piece of cake.