You can mod any injector I would imagine. IIRC, the stock RS injector is 270cc/min. Yes it effects the spray pattern. The Emanage should allow you to pull fuel at idle to run normally. I would look into sending your injectors (or buy a second set) to Deaschwerks (sp?) to be modified. Then weight that cost vs. buying a set of used wrx 440's.
~Josh~