Navi/Radio for Cayenne
 

I just bought an 04 Cayenne S-Type but it came without the PCM/Navi. I want to replace the stock radio/cd changer with something which has Navi/DVD/MPS/etc. but does not require alot of customization to the dash. Does anyone know or have installed any aftermarket head units, e.g. Pioneer AVIC series?

Any help is appreciated.

Marco