Infiniti today announced its rumored specialty-performance vehicle collection, the Infiniti Performance Line(TM). The first production vehicle from this group, the 348-horsepower 2011 Infiniti Performance Line G Coupe, debuts tomorrow evening at an exclusive event at the 60th annual Pebble Beach Concours d'Elegance. It joins the Infiniti line of performance luxury vehicles at Infiniti retailers nationwide in December. The Infiniti Performance Line, or IPL, offers a new level of premium performance for Infiniti vehicles, focusing not just...