Following the stir caused by the retro 2001 "Bullitt" (A lightly modified 2001 GT, named for the famed chase Mustang driven by Steve McQueen in the movie "Bullitt") Ford saw the value of heritage in the Mustang name and as a follow up, sought to revive the Mach 1 name. While similar to the Bullitt in the use of the Cobra's 13 in (330 mm) Brembo front brakes, unique Tokico gas shocks and struts, and lower and stiffer springs, the Mach 1 received a huge performance gain over the base GT and even the 265 hp (198 kW) Bullitt in the form of a unique variant of the DOHC 32–valve 4.6 Liter Modular V8. Commonly known by Mach 1 owners as an "R" code DOHC, (for the unique VIN engine R code) this all-aluminium engine features the same high flow heads as the 2003–2004 SVT Cobra, 2003–2004 Mercury Marauder, 2003–2005 Lincoln Aviator, and the 2003–2009 Australian Boss 5.4 L V8s (see Ford of Australia Boss 5.4 L), the engine also has intake camshafts sourced from Lincoln's 5.4 Liter "InTech" V8 to provide more mid-range torque. The Mach 1 engine had a 10.1:1 compression ratio in contrast to the 1999 and 2001 Cobra's 9.85:1, and the Mach 1 was equipped with a Windsor Aluminum Plant or WAP block unique from the Teksid aluminium blocks used in the 1996–1999 Cobras. The Mach 1 also featured a relatively high redline of 6,800 rpms (5-speed cars) and fuel cut off at 7,050 rpms or 5800 rpms (4-speed automatic). While on paper the 305 hp (228 kW) ratings seem a loss when compared to the 1999 and 2001 SVT Cobras which produced 320 hp (239 kW), in practice the Mach 1 engine produced similar peak horsepower and substantially more torque.