The red-hot Porsche Cayenne continues to turn up the heat with more speed,more luxury and a new Turbo S model touting the most expensive base price of any luxury Sport Utility Vehicle. While some may not understand the necessity for a 500-plus horsepower SUV,many Porsche enthusiasts,well-to-do celebrities and professional athletes understand it perfectly. The Cayenne seeks to be the highest-performance SUV on the planet,while still offering its owners the ability to tow a boat or horse trailer as well as occasionally venture off-road in complete confidence. Of course,you don't have to be a millionaire to experience the Cayenne magic. The V6 and S models cost about half of what the Turbo S fetches,yet still garner the same envious looks and approving thumbs-up gestures.