I'm looking at getting a COBB AP, the SF intake, COBB BCS, and the COBB downpipe (I already have the nameless exhaust) or turboback. How does the tuning work? Can I just use the AP to tune it myself or do I have to go to get it dyno tuned? I know this is a simple question. This is just my first WRX and I have no idea. If any of this sounds dumb point me in another direction on any parts or anything like that.