1) TurboXS Stealthback, race-pipe, straight-pipe axle-back.. It's quieter than you think and no restrictions. (You still have to take care of the uppipe though) and yes, it is plenty "throaty"
2) +1 for the trunk swap over the wing replacement... be sure you swap springs as well.. the STi wing is ~10lbs heaver than stock and the springs are heavier duty
-Shane