CAT for my new exhaust?

I'm upgrading to a 5" turbo back system. I'm trying to decide if I should add in a 5" MagnaFlow Cat.

At 5" and with the design of this Cat there is very little if any performance loss. It would me me street legal even there there is no state emissions testing on diesels in VA. It would also keep my shop legal.

Any opinions on this cat or any 5" cat in general?
Author: ehostler