Motor Trend Editor at Large, Arthur St. Antoine, takes Nissan’s hot new GTR to its top speed run on a closed course.

Race debut in the FIA GT at Silverstone.

FULL MUSTANG V 370Z COMPARO @ INSIDELINE.COM: www.edmunds.com When we last left the 2009 Nissan 370Z, it had just laid a drubbing on BMW’s little 135i. We then proclaimed, “The 2009 Nissan 370Z raises the standard for the sport coupe segment to a new level of affordable excellence.” Time to get more serious. It’s V8 time. Who’s in? Let’s see, no Camaro, and a Challenger is not available (don’t ask), so that leaves the freshly updated 2010 Ford Mustang GT, a car whose very existence is …