Are you talking about the spoiler? If so, it's fairly cheap and easy, but you're almost guaranteed to break the clip on the other side taking the spoiler off. All you do is remove the carpeting on the inside of the hatch, unbolt the rear windshield wiper and remove the motor (three bolts), then unbolt the spoiler (three nuts). There's a plastic clip on each side that costs about $2 or $3 from the dealer. They slide into the underside of the spoiler and then snap into bushings in the body.