I have a brand new FMIC CORE that I bought and have not used...infact I NEVER opened it from when it was shipped to me.
I bought it from http://www.cxracing.com
A friend of mine is running the same core on his wrx 2.0 with 20G and is at 337whp...so, it does work. It was tuned at GST.
It is 31x12x3, 3 inch Inlet & Outlet
Anyway, it's just a core so you would have to buy piping which shouldnt be too much and you can get a kit from http://www.cxracing.com
looking for $100. OBO local.