I contacted the owner of BRM exhaust today to inquire on the status of this project.
I was told that they are almost done with the finishing touches on the jig (fitted at Miami Muffler) and will be sold and shipped to the general public through BRM Exhaust in the near future.
http://www.brmexhaust.com/
While they mainly advertise products for Nissan/Infiniti vehicles, they do fantastic exhaust systems for many other platforms. I've known a ton of Nissan owners who love their BRM exhausts. It's hard to find a better quality unit for a better price.. You can check out the pricing some of the Nissan products on their webpage to get an idea. I'm sure on the pricing yet, but I suspect the BRZ/FRS system will be a little higher than typical 240sx system because it's true dual exhaust and thus needs more parts and more piping. Still.. I'm sure it will be a very attractive price!