The front-wheel drive HHR is available in three trim levels: LS, LT and SS. A 149-hp 2.2-liter four-cylinder engine and five-speed manual transmission are standard on the LS and LT; the performance-oriented SS gets a 260-hp 2.0-liter turbocharged four-cylinder engine with direct fuel injection, also mated to a five-speed manual transmission. A 172-hp 2.4-liter four-cylinder engine is available for the LT, and a four-speed automatic transmission is optional on all trims. The HHR LS is equipped with 16-inch wheels, cruise control, air conditioning, satellite radio and MP3 capability; LT trims add a power driver's seat and a cargo net. An optional 2LT package outfits the LT with additional features that include a sport-tuned suspension, alloy wheels, fog lights and a leather-wrapped steering wheel/shift knob (all of which are standard on SS trims). A more aggressive exterior styling, rear spoiler, polished 18-inch forged alloy wheels and unique upholstery are exclusive to the SS, along with standard Bluetooth wireless connectivity and a USB port for external media devices. Safety features on every HHR include stability and traction control systems, 4-wheel anti-lock brakes, front airbags, overhead curtain airbags for front and rear passengers and a tire pressure monitoring system.The Chevrolet HHR carries over with minimal changes for 2010. A power sunroof is now standard on the SS trim.