Theres no other way to pull the cat out, look at the size of it, its one whole piece. This isnt a typical cat like on the regular solstice or any other car, it sits in the engine bay with tight clearences. Go look for yourself how tight of a fit it is.
Maybe Jeff can clear up whats involved in pulling it out, but i think he mentioned putting a jack under one of the motor mounts and lift it like an inch or so. Wiggling it out is the hard part.