666 is considered the devil’s number and the following custom 2015 Ford Mustang GT California Special just so happens to pump out 666 hp at the rear wheels. It really is a car which would scare the living hell out of an SRT Hellcat (pun intended) and is among the finest sixth-generation Mustangs we’ve come across.
The car is owned by a member of the ADV.1 wheels team and is used on an everyday basis. Despite that, the owner hasn’t held back in outfitting it with a selection of aftermarket components to not only improve its performance but to also give it a more menacing look.
Most significantly, the 5.0-liter Coyote V8 engine has been fitted with a 2.9-liter Whipple supercharger. When combined with a 132 mm billet throttle body, new injectors and fuel rails, a 3.75-inch pulley, ECU tune and Corsa Extreme cat back exhaust system, the car delivers 666 hp and 510 lb-ft of torque at the rear wheels. At the crank, that translates to around 750 hp.
Alongside these engine upgrades, the car has been outfitted with coilovers courtesy of BC Racing to dramatically improve its handling. Also included in the project are a set of ADV005 MV2 wheels measuring a massive 20×11.5 at the rear and 20×10 at the front and wrapped in Nitto NT05 tires, designed to maximise grip.
To ensure this Mustang GT leaves SRT Hellcat’s quivering, it has a subtle spoiler and a prominent front splitter.