According to Japan's Car Top magazine, Nissan recently paired up 30 advertising and marketing executives with racing and test drivers on a secret burn in the 2008 GT-R at the company's Tochigi proving grounds. One unnamed test driver told the magazine it was a closed track day — no media types were invited. They reportedly subjected the GT-R to a battery of tests to compare it with a 350Z (Z33 Fairlady Z) and a 997 Porsche 911 Turbo. Attendees were told the test cars' interior was fake, and the cars still wore the black mask seen in every recent spy shot. The mole also reported the company says seven GT-R models will be released in various markets, and you'll be able to get them in any color as long as it's silver, the gun metal gray, white and black. Candy purple flake will ghost figures underneath 17 applications of clearcoat will remain an aftermarket option. [via 7tune]