My 05 STI has a stk motor, turbo, TMIC with following mods and makes 290 whp on a Dynojet. You can squeeze another 10-15 hp out of it by adding an uppipe and CIA + re-tune.
Upgrades:
Cobb TBE
Maddad UEL headers
Pro-tune
Running stk:
airbox,
injectors
fuel pump