I would like to see pictures Model!
Did you have the studs replaced at the repair shop that you had your rotor replaced at?
Studs are extremely easy to replace by yourself, you might want to do the rear ones just to be safe(if not done already) you can press the stud out using a socket, and clamp, and press it back in doing the same but reverse. Unless you have the special tools to do it with then you won't be needing the socket and clamp haha.
Studs should cost you about $10.00 total.
Blade.
Banana do you know how much a turbo costs? Tis' a pretty penny. Truely in my opinion if you are going to turbo charge your engine, pull it, port and polish the intake and exhaust valves, bore the chambers, give it a shorter stroke, get some real 'racing wires'
MSD wires, distributor cap, rotor & coil, E3 Spark Plugs, change the camshaft out, the works really. No point in turbo-charging an engine that has probably been driven hard.