Why cobb tuned? Opensource is much better IMO, assuming your talking about an accessport or something along those lines.

How many miles? ej20's are decent motors, but if you're planning to make over 350wheel, you better have some money set aside for when that stock motor grenades itself.

If you want to use a conventional T3 gt30, then you're gonna need a rotated uppipe, different downpipe, etc. Full-Race makes a stock location 30r, but it's a good chunk of change IIRC. But then again so is a rotated kit.