What @
Tcoat said. If you can find them used, it might be worth while. A dealership would probably gouge you for them. I recommend driving a 16/17 and see if you feel its worth the hassle to swap the suspension into your car. Especially if you're doing to pay a shop to do it.
Edit. FWIW is find my car more compliant then in was on the stock suspension. Also, the RCE Yellows helped make the ride a little less harsh as well.