The Good: The 2008 Porsche Cayenne Turbo's twin-turbo V-8 delivers staggering performance for an SUV. Its dynamic chassis-control and stability-management systems enable the car to be optimized for road, track, or trail driving. The Bad: For a car with a six-figure price tag, the Cayenne Turbo's cabin technology is woefully out of date; its phone system in particular is disastrously designed. Some of its options are comically overpriced. The Bottom Line: The 2008 Porsche Cayenne Turbo is a performance powerhouse but a cabin-tech laggard, and while its off-road credentials are unquestioned, it is unlikely they will ever be used. This is one $100,000 mall crawler that owes more to its badge cache than the quality of its interior amenities.