g8 gt engine issue
The G8 GT is a bit of an oddball with accessories. I would recommend getting a complete G8 GT engine if you want something drop it. The labor cost and tracking down parts will cost you more in the long run otherwise.
It really depends what you want to do with the car. You have lot of options, but a lot of them require changing wiring, sensors, programming. If you want more HP,it is all worth it. If you just want to get in running and sell it, probably not.

