The new generation 2014 Porsche 911 GT3 goes against the Aston Martin V12 Vantage S in a battle on the race track. With 475 hp from a 3.8-liter boxer engine and with a PDK double clutch transmission, the 2014 Porsche 911 GT3 hopes to win this battle. However, the Aston Martin V12 Vantage S develops 573 PS from a much larger V12 engine.