Ford introduced their new Barra straight-six 4.0 litre DOHC VCT engines into the lineup, which included a turbocharged (/) version and base line () naturally aspirated version. The BA also featured a new North American designed 5.4 L "4V Boss and Barra 3V" V8 engines. The "Barra 220" (/) "Boss 260" (/) and "Boss 290" (/) engines were smoother, quieter and more fuel efficient than the Ford Windsor engine used in the AU. In October 2004, Ford released the Mark II update of the BA. Amongst the changes was a six-speed manual transmission, four new exterior colours, and revised wheels trims.