yea, should have the same kind of honey comb internals like a gasser Cat. just take a chunk of pipe, like 3/4 or 1" in diameter, with a big hammer, then just start driving it thru the core. once you get the pipe to go thru the core a few times, it will start falling out the cat. make sure you get the steel wool, scour pad looking things out too. they wrap around the outside of the core, and usually stay put after you knock the core out. ive had that scour pad thing heat up before, fall out of the cat, and clog my exhaust. when your completely done with it, you can even go ahead and weld a pipe into the cat, so the exhaust never even sees the "expansion chamber" you just created.
one thing tho. by hogging out the cat, you will destroy it, and its functionality. plus your car will be louder. it may only be negligible , but it will be louder.
i take no responsibility for you destroying your cat.. cause if you do what i said, it will end its life. lol. but your car will thank you for it.