I don't know that it would take a full day to do the eliminator kit install. I also have the gtrs, and I can pull the turbo off and put it back on in probably two hours.....longest part is waiting for the coolant to drain and refill....atleast mine takes forever. It could be done, granted there are not too many problems in four hours, no problem. The oil return line is a b***h, but other than that, not too bad. Oh, and before I did the eliminator install, the most I had ever done to a car was a brake job. So I think almost anyone with any brains could install it. Either way, good luck and let us know how you like it 1 point 8 tee.