PHOENIX — With no less than 14 model variants of the Porsche Cayenne SUV there’s a new range-topping Turbo GT that’s the most ultimate Porsche Cayenne ever and is the closest to a Cayenne GT3 as Porsche has ever built. It’s the fastest, most powerful, and with a starting price of over $190,000 the most expensive sport utility vehicle ever by the German sports car maker.