I'd say shave all badges, swap the trunk to either a WRX trunk or a 2.5RS trunk, leave the hood scoop or swap to a carbonfiber WRX hood. Get a dark tint to hide the interior, and possibly swap the rims for something more after market. Also remove that STI badge on the steering wheel. For the most part it will look like a WRX or a 2.5RS but if some one looks closely they can tell. I've been thinking about doing this myself. We will see if I actually do it.