To know the exact towing capacity for *your* specific 2006 Porsche Cayenne, you should:
* Check the sticker inside the driver's side doorjamb: This sticker lists important vehicle information, including towing capacity.
* Consult your owner's manual: This manual provides detailed specifications for your vehicle.
Without knowing the specific trim level and options of the 2006 Cayenne, a precise number cannot be given.