I think this car should be a poster child for the Cobb Accessport. Give the kid the car detuned to 160whp when he's 16, but let him know that a year later you'll bump it up to 270whp like stock if he's got a clean driving record. And then if he keeps the clean driving record you bump it up to the max. You can even program rev limiters and speed limiters, and if you've got the AP he wont be able to retune it.

I think its stupid to give a kid that much car at a young age, especially coming from a fairly well off high school and seeing kids trash brand new 3 series and Benzs when they were 16 and those cars had less than half the power of this STI.

Anyways, at least the Greddy turbo upgrades are weak on subarus unless you do some serious turbo work. Out of the box they're all limited by small exhaust housings that are easily remedied by aftermarket 8-10cm housings.