Correct, no GTS here...I could not find one quite to my liking. Most of the ones of my generation have the horrible 2 tone interior. So I settled on the Turbo version.
Also, yes, the pipes suck balls to do, but luckily it only happens once. As Andy states below, the second gen Cayenne's do not suffer this fate as I did.
I highlighted 2 things Andy listed that my Cayenne suffered from. Overall, the 1st gen Cayenne is known for 4 main problems; the coolant pipes, the air pump for suspension, carrier bearing on cardan shaft, and the 4-5 solenoids in the valve body of the trans.
The pipes I did myself. Porsche books it out at 12 hours labor and it took me about 13.5 while drinking and taking my time. Horrible pain in the ass as they are under the intake manifold and brittle plastic that doesn't want to come out.
The cardan shaft issue also happened to me. Best I ever heard it described was on rennslist as tiny midgets in or under your console with little hammers tapping. I replaced my drive shaft with one from vertex and also upgraded the bearing mount to their new style that will not fail again. I do seem to have slightly firmer shifts, but nothing obnoxious.
One piece of advice, if you ever need a part, see if there is a cross reference for a VW part. Case in point, my air pump went bad for my air suspension I called Porsche and it was close to or just over 200. I found the OE VW part for 10. Not a typo. 20 minute fix.
The valve body was done upon buying the car. When this goes bad it happens under heavy load when accelerating and shifting from 5th to 4th. It feels like the trans is falling out of the car.
I believe they fixed these issues I have had with mine in the new ones. Overall, I LOVE my Cayenne and can only imagine the 2nd gen to be even better and more enjoyable. In a few years I will probably step up to one of them.
Good luck!