Pure competitors of the 2008 Porsche Cayenne include any SUV built to perform equally well on and off the road, limiting the list to the Land Rover Range Rover Sport and the Volkswagen Touareg, the latter of which shares basic engineering and design with the Cayenne. Marketplace competition also includes the Audi Q7, BMW X5, Infiniti FX, Mercedes-Benz GL-Class, and Mercedes-Benz M-Class. It's also possible that someone might cross-shop a Cadillac Escalade with a Cayenne.