For those that deem 550hp insufficient for their needs.
Shelby Performance Parts has introduced its latest supercharger kit, built for the 5.4-liter Triton Modular V8 that sits in 2007-2012 GT500 models. They claim it adds up to 300hp to the existing 550hp the GT500 produces from the factory. Replacing the stock Eaton roots-type supercharger is a Shelby/Whipple 3.4-liter Black Supercharger Tuner Kit, which according to Shelby is the largest twin-screw system available for the Ford 5.4-liter V8 engine.
To improve cooling performance Shelby also introduced a new Competition Heat Exchanger, made up of two 11-inch fans that keep airflow focused on the supercharger's core. They also revealed a Shelby GT500 Competition Intercooler Tank, which can be filled with ice or dry ice to reduce the risk of heat soak and lower intake temperatures. Shelby confirmed the system is a direct bolt-on, which Mustang owners have been enjoying for decades, providing higher boost levels than the stock blower at any given rpm.
It also manages to lower discharger temperatures and parasitic power loss. When properly tuned, a standard 3.5-inch pulley helps the monster supercharger deliver around 17 psi of boost.