From the 2009 Order Guide:

2D1 Sportdesign Package
Unique front and rear lower bumper covers, extended roof spoiler, and
rocker panel extensions. Note: This option restricts off-road capability.

Cayenne $4,785
Cayenne Tiptronic $4,785
Cayenne S $4,785
Cayenne GTS $0
Cayenne GTS Tiptronic $0
Cayenne Turbo $4,785
Cayenne Turbo S $4,785


2D2 Sportdesign Package w/Offroad
Sportdesign package in combination with advanced offroad technology
package including PTM plus. Front end covering, rear-end covering, and roof
spoiler.

Cayenne $3,395
Cayenne Tiptronic $3,395
Cayenne S $3,395
Cayenne Turbo $3,395
Cayenne Turbo S $3,395

 

but imcarnutts - i think the "unique" of the front and rear lower bumper covers is that they are body colour and nothing else.

forgot about the spoiler though

 

sparkhill, seems you will never need to buy another car again with car and sled turbos.......It makes me want to sell one of my houses and go get new goodies......