In addition to the wing that goes on the rear hatch, there's also a piece that goes on the bumper cover to cover the hole left when the regular wing is removed. Make sure you get both parts.
You can leave the existing wing mechanism in place. However, you will need to go to the dealer and have them disable it. It's possible that someone might be able to do it with the Pro version of Durametric, but not sure. If you leave the existing wing and mechanism in place, you wouldn't need the piece that goes on the bumper cover, but that's weight that could be removed.
Also, Porsche recommends that the R wing only be installed in conjunction with the matching front bumper lips. Not sure how vital that really is, but Porsche claims it will upset the balance of the car if both ends aren't done.
BTW, the R wing does not actually provide downforce. The best it can do is reduce lift. IIRC, the lift reduction is about 50% of the "normal" lift.
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