916MKIIIx2, oh I agree with you on everything but drifting. I suppose the form on the track is one thing but going into a parking lot and letting loose is juvenile. It could also get you a ticket for restless driving and perhaps trespassing charges. Do remember the "sport" was created by a group of Japanese auto otaku. Most people including me think they are very weird at best.
Oh back on subject, a well maintained car is your best ticket to happiness than all of the extras invented. It is the small things that make a difference. A loose or broken vacuum line makes all of the difference. I would get your Supra running well before adding a turbo, my question would be why do you need all of that HP? If you race on the track ok but for street travel you are asking for trouble. My guy a 86.5 7MGE has the potential for getting me in trouble.
Whatever you do be safe and do not do anything stupid.