penko

I was thinking of putting a front mount i/c in my t2 and i have a few questions.
How much flow does the stock unit has in cfm
Am i in for for a lot of turbo lag with the front mont
Can i install it with my stock front bumper
What kind of hp benefits should i get froim this

My mods are 3inch custom exhaust,hks ssqbov,tilton clutch, jspec ported turbo, cold intake , walbro ,680cc secondaries,safc,
manual boost control,a/f gauge, hks boost gauge.
My goal is to have a reliable car boosting 15-18psi please
correct me if i'm wrong and tell me what am i missing beside the egt gauge ,wich i'm gonna buy in a near future.
thanks.