Another funny thing about Porsche: nowadays, they are mostly built with VW parts. Cayenne has at least 80% of VW parts. When you take the car apart, you will notice VAG/VW/Audi logos everywhere, from electronic modules to simple connectors. Some parts are even Seat branded (which is a budget VAG brand, like a Skoda, only made in Spain).
Anyway, Porsche has their own part # for everything. So if you go to Porsche dealership to buy say a broken parking sensor, they will give you the Porsche part #, not the real VW part #, which is printed on the actual part. When you know the VW part # for the part you need, you can go to the VW dealership and get it from VW for like ... 60% of the cost. And if that part happen to be used in Skoda or Seat, you can get it from there for like 30% of Porsche cost, lol.