Some residents of southern California, one of Porsche’s largest markets and the location of the 2006 Porsche Cayenne Turbo S’s debut, are vain and terminally insecure, often ripping the badges off of base-model luxury cars so that nobody knows they couldn’t afford the best. They’ll pay more than $40,000 for a slow Porsche Cayenne V6 just so they can say they’ve got a Cayenne, and they might even slap a “Turbo” script on the tailgate that fools nobody with a 10th grade education. So if Mr. Smith can one-up his Cayenne Turbo-owning neighbor Mr. Jones by driving home in a Cayenne Turbo S, he’s gonna do it even if it costs six figures. There is no possible need for an overweight, overpriced, 520-horsepower, all-wheel drive station wagon that can barely muster double-digit fuel economy, except among the vain and terminally insecure. If you want a fast truck, get a Jeep Grand Cherokee SRT-8 and use the $70,000 you saved to send your kid to college.