Unbolt flanges from headers, and resonators from connecting pipes, and center hanger from transmission. Exhaust will then drop down. Center hanger from transmission is not used on new pipe. It's not necessary without secondary cats.
Take out O2 sensors and put them in new HFC section
Close up of Secondary Cat Delete
make sure to take this mount of X section and bolt it onto new pipe in same location before installing. Slide the X-pipe and HFC sections together but don't tighten yet.