For 1999, the Mustang received Ford`s New Edge styling theme with sharper contours, larger wheel arches, and creases in its bodywork, but its basic proportions, interior design, and chassis remained the same as the previous model. The Mustang`s powertrains were carried over for 1999, but benefitted from new improvements. The standard 3.8 L V6 had a new split-port induction system, and was rated at 192 bhp (143 kW) 1999-2004,[36] while the Mustang GT`s 4.6 L V8 saw an increase in output to 260 bhp (190 kW) (1999-2004), due to a new head design and other enhancements. There were also three alternate models offered in this generation: the 2001 Bullitt, the 2003 and 2004 Mach 1, as well as the 305 bhp (227 kW) (1999) 320 bhp (240 kW) (2001-2002),[37][38] and 390 bhp (290 kW) 2003-2004[39] Cobra.