You are better off with the 4cyl. that you have. The 2.4L MPI engine is excellent, if maintained, and moves the car quite well, and gets good mileage. The V6 only makes 19HP more, weighs more, and uses more fuel. The newer GDI 2.4L will physically bolt up, but everything else is different(electronics, fuel system, exhaust). It is not feasible, IMHO.