If you don't plan on keeping the car and really just want a DSM to toy with, I don't see the point of spending any money on this car. Save it for the car you want to have fun with. After I totaled my GTC and got the Vision I don’t spent any money on the Vision unless I have to. I have been saving my money for my new GTC.
If you really have the need for more power get the MBC and run a little more boost, but don't waste money on a new turbo especially if you're worried about blowing the engine. Running 15 PSI is a lot and you had better have the fuel, engine management, and intercooler to support that or you can kiss the engine goodbye. All those cost money.
My suggestion; save the money for your DSM.
