An option package that dresses base models in GT trim highlights the 2006 Mustang. Base and GT models come as coupes and as convertibles with a power fabric top and heated glass rear window. Base models have a 210-hp V6, GTs a 300-hp V8. Both engines team with a 5-speed manual transmission or optional 5-speed automatic. Base and GT Mustangs come in Deluxe and Premium trim; base models also offer lower-priced Standard versions. All have 4-wheel disc brakes; ABS with traction control is standard on GTs, optional on base models. No antiskid system is available, but front side airbags designed for head and torso protection are available. Newly available for base Premium models is the Pony Package that includes GT-style grille-mounted fog lamps and a rear spoiler. Coupes have 50/50 split folding rear seatbacks. Leather upholstery is standard on GT Premiums, available for other models except the base Standard. Due to join the lineup later in the 2006 model year as an '07 is the Shelby Cobra GT500 with a supercharged V8 of 500 hp.