Do not put a Greddy type s on your Subaru. Trust me, I also would stay away from turbo XS bov's for Subaru's. Like I sated before. If your on a stock turbo, or fairly stock set up (including a vf series turbo) stock is going to be your best bet. If you just have to have that bov sound, go for the tial or super sequential.
If you go front mount, and want recirc, go aps(I forgot about them in my first post). They have quality parts. Open atmosphere I still swear by the super sequential and the tial.