You would really have to completely rebuild the engine if you wanted to add a turbo to it after you do the N/A setup... I am going to build this engine NA and my old motor I am going to setup with a turbo, have 2 powerful engines for the car, what could be more fun lol Of course this is all plan, I will not know how much I can do until after I get this job and get settled and start saving some money... So this will be a long project for me and something fun to do...