The good news is that if you are adding them to a car you have already bought, you don't have to buy everything all at once. You can do it as 3 projects if you want to spread the cost out. While researching the 2012 Si I saw a couple with the front and rear done and the sides to be done later. If I had bought the car less spoilers and planned to buy the spoilers later then I would have done the same. The front first, the rear later, maybe the sides last.