You could also look at the stuff Stout racing used which is JRi. The JR in JRi used to be a lead engineer for Penske. They sell very modular and user revalvable/rebuildable shocks as well.
They have a set for the GR STi which is almost identical to the BRZ/FR-S.
http://www.jrishocks.com/shop/street...stable-shocks/