I believe stock SI injectors are 330cc. Vit told me the 550CC that come with the 3.6" kit will be maxed out and if I do go smaller pulley I'll need to put higher flow injectors in again. I decided to get the 1000cc injector and pay for them and the tune one time. I still need to change the spark plugs & add a better fuel pump, but essentially I'm done when the tuning stops. I've been very happy with Vit and his advice. Yeah, I've spent a lot of money (~$5K in total), but I've got the quickest Civic in my upstate NY county.
List:
Skunk 2 CAI, OEM throttle body bored to 68mm, CTe Supercharger with 3.6" pulley, 1000cc DW injectors, RV-6 catted downpipe, OEM catback, Flashpro with Vitviper tune