turbo install questions

i have the turbonetics single turbo stage 1 kit. i also purchased a UTEC for it. im going to purchase bigger injectors. and im debating buyin a water/methanol injector kit. my goal is 400whp my tuner thinks this is very possible. i have not done the install yet because i am currently deployed in the desert. i want to know if should add anything else to reach my 400 goal.