Ford revived the Boss 302 nameplate for 2012. The standard 2011 Ford Mustang GT's 5.0-liter Coyote V8 engine is enhanced and was referred to within Ford's development teams as the Road Runner engine. Upgrades include a forged rotating assembly, CNC ported heads, revised camshafts and a high flow "runners in the box" intake taken from the 302R racecar. It produces 450 PS (444 hp; 331 kW) at 7400 rpm – 32 hp (24 kW) over the standard GT's 412 hp (418 PS; 307 kW). The engine loses about 10 lb⋅ft (14 N⋅m) of torque at peak when compared to the standard GT. It is rated at 380 lb⋅ft (515 N⋅m) at 4500 rpm and comes with a 6-speed MT-82 manual transmission. A solid rear axle with 3.73:1 differential uses carbon fiber plates in its limited slip differential or an optional Torsen differential. The quad exhaust system made up of two standard Mustang GT outlets and two side pipes that exit on either side of the rear crossover. The side pipes send the exhaust through metal "Attenuation" discs to create an extra growling exhaust sound. The discs are removable and include a spacer plate sized to match aftermarket exhaust dump valves.