Aston Martin Racing has unleashed a new Vantage GT4 for 2011. The new V8 race car takes design inspiration from Aston Martin's V12 Vantage road car, giving it enhanced aerodynamics and increased downforce.The Vantage GT4's new splitter increases downforce at the front of the car, as well as channelling cooling air to the brakes and radiator. At the rear, the car gains the V12's larger boot 'flip'