Never herd them reffered as optional lip kit, I always herd them called Oem optional kit. They are expensive, friend just paid $1000 shipped for sides,front lip,rear lip..

My suggestion is just get a oem front lip and paint sidesskirts, than you be good to go..dont wanna bring alot of attention to yourself w/ optional kit!

And whatever you do DONT get the replicas!! fitment is really poor!!..thats if you still want optionaal kit.