To begin with, Nissan maintains that the GT-R SpecV is aimed at the discerning enthusiast, the same kind of buyer that would pass up the Porsche 911 GT3 for the RS variant. For $170,000, that's a very select group of consumers, but we doubt Nissan will have much difficulty moving the 20 to 30 SpecVs it'll be producing each month when sales begin February 8th.Peak output remains the same, at 478 horsepower, but a switch on the right of the steering wheel (shared with the cruise control) activates an electronic circuit to boost mid-range torque by 15 lb-ft (up to 449 lb-ft). A green light illuminates on the dash when the overboost function is enabled, giving drivers 80 seconds to perform any overtaking maneuvers, and then defaulting back to the standard setting.The SpecV's carbon ceramic brakes were developed in conjunction with Brembo and are painted silver to differentiate the upgraded stoppers from the standard GT-R. Although the six-piston (front) caliper size remains the same, the discs have been upgraded to 390mm (15.35 inches) and fitted with SpecV specific brake pads. Nissan claims a weight savings of 11 pounds per corner and –2.0 Gs worth of stopping power, but the system comes at a cost: $45,000.The 20-inch RAYS forged aluminum wheels – the same units offered on the NISMO Clubsports GT-R -- also contribute to the overall weight savings, which comes in 132 pounds lighter than the standard model at 3,704 pounds. As mentioned in our previous post, Nissan replaced several components with lightweight carbon fiber, including the seats, interior trim (even the seat-back adjuster), grille and brake ducts, along with the trick dry carbon fiber rear wing (coated in clear matte paint) that increases downforce. The Bilsteins have been retuned to be more responsive on the racetrack and the engine cover has been replaced with a SpecV-only piece. The standard GT-R hues are available, but if you want to stand out, the Ultimate Opal Black paint job will set you back an additional $6,100.Nissan hasn't released 0-60, 0-100 or quarter mile times yet, but we expect some official figures in the coming weeks. And as for a Nurburgring time... just you wait.