Had a AVO bolt on turbo installed on our 2014 FRS, all I can say is "AWESOME"
The car does not loose any of what makes it an FRS, handling, ride, anything, just makes it so much more car and way more fun.
Cost is up there but in my opinion it is way worth it. right now 5 PSI boost gets 240 WHP, adding a boost controller to get the full potential out of the turbo with the stock injectors, to get it to 8-9 PSI and will gain another 40-50 WHP. After spending the money, i know it was well worth it when after my wife drove the car all she could do was smile and talk about the added power. All good stuff.