var addthis_pub="mastersaNissan GT-R Tuned by Cobra N+ with up to 620HPGerman tuning firm COBRA N+ has announced the development of a new performance package for the GT-R that will be available just in time for the Japanese sportscar's European market launch in the spring of 2009. In standard form, after its recent facelift that is the four-wheel drive GT-R comes equipped with a twin-turbo 3.8-