Tuning a BRZ

I have only owned my BRZ for about eight months and I decided to take the plunge a few months ago and spend some money on some tuning options. Took it to a shop that one of my good friends owns let him do this magic and I wasn't disappointed. Now I never really loved the car to start with but at the time it's the purchase I made. I'm looking to sell so do I take it back to stock or keep it? via /r/cars http://ift.tt/2suFyyf