I do plan one day with in a year to a year and a half to have the trd S/C, I just have other mod's in mind and plus I want my car payed off in full first. I'm thinking about an injen intake for now. Do I need to keep my air box or does the trd kit come with a whole new intake system? Already have a catback, am I really going to feel a difference with an intake? What would you do if you have this option?