i'm not exactly a genius when it comes to this but i figure at least around 1,000+. you would have to buy the unit iself, cut a hole in your roof, and labor,labor,labor. unless you do it yourself....but still, i have one and i don't think it makes that much of a difference. it's cool to have one, but the contour sunroofs have been known to be a little tempermental. mine works on and off and now the gears are off again. it is a common problem, just more stuff to wory about. that's just me though.