The Sky comes in two trims: the Base and the Red Line. The Base is powered by a 173 hp 2.4 liter Ecotec four-cylinder engine and the Red Line has a 260 hp turbocharged 2.0-liter four-cylinder engine. Both engines are mated to a five-speed manual or an optional five-speed automatic transmission. The Base comes equipped with: Stabilitrak, four-wheel anti-lock disc brakes, 18-inch alloy wheels, satellite radio, cruise control, OnStar, security system, and power mirrors, windows and door locks with remote keyless entry. The Red Line adds: dual-exhaust tips, sport-tuned suspension, leather shift knob and steering wheel audio controls. For 2008, the Saturn Sky receives a satellite radio, and a tire pressure monitoring system (TPMS).