I was quoted around $800.00 for one unit and shipping, Ouch I know. Still less than half of doing the RS retrofit and custom exhaust. I really like the SS Tuning diffuser but it only the lower diffuser part and not the entire valance. My goal is to get rid of that cheesy plastic part(to me) that runs from one side to the other. I really like the RS styling of the Maxton, gives the rear end a completely diff look.