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The car is/was available with the sport design front bumper/spoiler and then with/without the ducktail. You cannot have any rear spoiler (ducktail or sport design) without the front sport design setup.
I prefer the clean look of the 991 without the rear wing or ducktail. As others have stated, you can get the front sport design bumper without having to get the rear wing/tail.
I just ordered Aerocup kit and think it's great, and makes the car look aggressive and sporty. So you are going to get personal opinion here, the decision is really yours.