if I use boost controller
what should I change together?
Fuel injector? fuel pump? and what else?

 

that depends on how much boost you want to run and what kind of otjer supporting mods you have.

If you have an open exhaust, good intake setup, and a SAFC you could run 10lbs+/- without hurting much (I have limited turbo knowledge so don't take just my word for it). You shouldn't have to worry about fuel and such until aproaching the 300rwhp+ mark...then it's a concern.

 

so the most important is intake and exhaust right?
and what is SAFC?

 

Yeah, basic performance upgrades are essentially intake setup and exhaust setup...make sure everything is flowing freely.

I am the last person to tell you the specifics of an SAFC. It basically tunes the airflow by feeding the ECU false info (I believe, do a search, you'll get lots of responses, also do a search on 'BPU', that will prolly be most helpful to you)