Has anyone thought of using the 12L Spec C intercooler tank as a reservoir? It has a pump installed from the factory, but I'm not sure if it would work for an AWI setup. I know people have converted them to work for meth injection. They are pricier than the frozenboost.com reservoir, but are "factory" products and look pretty slick.
http://www.rallysportdirect.com/part...-sti-2002-2007