398 lb·ft (540 N·m)). The Boss 302 motor was also added to all V8-powered FPV models until the release of the FG in 2008. The Boss 302 was then used for the limited edition FPV GS in the FG range. Boss 315 For the FG MkI, the 5.4 was further tuned to produce 315 kW (428 PS; 422 bhp) and 551 N·m (406 lb·ft). FPV achieved this through a new camshaft profile, new camshaft timing, strengthened piston assembly and a higher compression ratio (10.5:1 to 10.8:1). 5.0L Coyote "Miami" V8 In October 2010 FPV retired the 5.4L Boss V8, in favour of a new supercharged 5.0L V8. The project, codenamed "Miami", is based on the Coyote 5.0 litre V8 and is a supercharged alloy quad cam engine. It has cost FPV $40 million and has taken 3 years to develop. The engine was offered in three versions, Boss 315, 335 and finally 351. With the closure of FPV, the Boss 335 engine was used in the returning XR8 model with the FG-X range. Another variation was developed for the special edition XR8 sprint, that developed . Boss 315 Used in the entry level GS sedan and ute, the Boss 315 produces 315 kW (428 PS; 422 bhp) at 5,750 rpm and 545 N·m (402 lb·ft) between 2,000 - 5,500 rpm. Boss 335 Available in the GT range, the Boss 335 kW (455 PS; 449 bhp) between 5,750 - 6,000 rpm and between 2,200 - 5,500 rpm. The latter is offered in the GT range, which includes GT, GT-P, and GT-E. Fuel economy was improved dropping 4.5% to 13.7 L/100 km for the auto and 13.6 L/100 km for the manual. Boss 345 Exclusive to the FG X XR8 Sprint, the Boss 345 developed 345 kW of power and 575 Nm of torque, with base torque figures being just 1 Nm shy of the XR6 Sprint. In favourable atmospheric conditions, overboost mode raised the output to 400 kW / 650 Nm, being equal with the figures produced by the FPV GT-F. The Boss 345 had the build number inscribed onto the top of the engine, instead of any reference to power figures as with previous iterations. Boss 351 This is a specially tuned variant of the 5.0L unique to the GT-F, similar to the Cobra before it, the 351 is a reference to the Cleveland engines offered in the Falcon in