Hello, I'm purchasing a sr20ve and I wanted to know which program would be best for my setup.

N1 cams.
3' inch piping.
Pop charger
Header
Fuel rail and regulator.
Stillen flywheel.


but all these application will not be installed right away. Should I get a basic ECU, and then upgrade to realtime? or just get a realtime ECU and tune it each time I add a modification?

Also does it matter what year the sr20ve motor is?