Horsepower and torque are the product of both air and fuel. The more of both (in the correct ratio) that you can squeeze into your 2005 to 2009 Mustang GT's 4.6L V8 the more power it makes. Our selection of air and fuel upgrades will have your Pony pushing out a ton of extra horsepower and make your Mustang feel like an entirely new car. Because your Mustang runs slightly rich from the factory, you should start off with a cold air intake, throttle body, or tuner package for easy and awesome horsepower gains. In general, you don't really need to update any part of your Mustang's fuel system until you're putting a lot more horsepower over stock, but for those of you throwing down a ton of power or putting together a supercharger or turbocharger tuner kit, then you're going to need some up-gunned fuel hardware.