yes, yes, you need the intercooler. I am ashamed I didn't list that.
3 port BCS is a better Boost Control Solenoid for more accurate boost control. It's a mod that requires a tune but if you're going to get it tuned, you might as well do it. They're very cheap and can make your boost curve a lot smoother.
Also, have you discussed with your folks what you'll do if the tranny can't handle all the added power? Not saying you need to upgrade the tranny first, but you should have at least thought about what would happens if you put in a much larger turbo.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD