Damn, gt17, that is smaller than a T2 housing. You can tell I am new to the classic subaru world. What are you doing as far as fuel management. I know that if you crank that up to 11 psi you are gonna be pretty lean. Do you plan on keeping it at a more resonable level? I have some schematics for a cheap relay setup for an additional injector if you wanted to up the fuel system. Look into water injection too, as it may allow you to run a little more boost without risk of detonation.