There's really no point to modding a 2.5i's engine unless you're made of money. Intake is useless, they give you CELs and take all that low end power that NA engines are supposed to have and stick it right at about 4000 RPM. Ask yourself, when you will ever constantly be at 4000 RPM?
Also, UEL headers and exhaust are pure aesthetics, meaning they will give you very very minimal gain for the money you will have to pay for it all. Is 5-10 HP worth about 600-1000 dollars? Also skip the hoodscoop ... I don't know why the hell you'd consider one but it looks tacky on a car that doesn't need it and it'll attract all sorts of idiots wanting to race you
Don't even think about putting a turbo on a brand new car. You're likely not going to do anything to support the turbo kit (engine work), so even if you're running 5 psi, you're putting a LOT of pressure on your engine internals, and that all = big kaboom. At least drive it until the warranty is over.
Lesson here is WORK ON YOUR SUSPENSION. Since the engine is too costly to mod, work on your suspension to make it fun to drive around and tossable around corners. Start with a rear sway bar, since your car doesn't come with one. Work your way up to WRX struts later, then maybe even coilovers if you so desire. Don't forget tires, too. Your stock RE92 tires are garbage.