if i change my injectors to drop in some 740cc , and put in a 32 maf , chip my ecu wil i get more hps? i saw an mines tuned ecu on ebay ? , they said 340whp possible with an gt2540 or gt28rs turbo but if i keep my stock s13 t25 turbo? wil i still see a difference?

 

I take it you have an SR20? Injectors that big won't help you unless you're putting up some monster numbers already. 550cc injectors are good up to 400hp or something like that. Also, the GT28 turbo is WAY better than the stock T25. You won't get near that power keeping the stock turbo, but you will see a difference with a chipped ecu.