It's a free mod. You just take the driver's side wiper off, and move the passenger side one up a few degrees. My bf did sand and paint my wiper to match the car so I guess it costs a few bucks.
something you should do after you set it up is get a 22" blade so it wipes more and use rain-x on your windshield. It just doesn't wipe enough and is a pain. I just took mine off friday