The Chevrolet HHR (an initialism for Heritage High Roof)[1] is a retro-styled, high-roofed, five-door, five-passenger, front-wheel drive wagon[2][3] designed by Bryan Nesbitt and launched by the American automaker Chevrolet[4] at the 2005 Los Angeles Auto Show[citation needed] as a 2006 model.

[4] The HHR shares the GM Delta platform with the Chevrolet Cobalt, Pontiac G5, and Saturn Ion.

[7] A "Half Panel" (RPO code AA5) rear quarter window delete option was available in the 2008 to 2010 model years.

These included power windows and door locks (front for the HHR Panel Van and front and rear for the standard HHR), dual front SRS airbags, a Driver Information Center, an A/M-F/M stereo radio with a single-disc CD/MP3 player and an auxiliary audio input jack, a four-speaker audio system, a tilt-adjustable steering wheel, keyless entry, cloth seating surfaces, a folding rear bench seat (for standard HHR models only), manually-adjustable dual (front) bucket seats, a compact spare tire and wheel, air conditioning, and a five-speed manual transmission.

The HHR could also be ordered with many luxury amenities (depending upon the trim level selected), such as a power-adjustable front driver's seat, a Pioneer seven-speaker premium audio system with an external amplifier and rear cargo area-mounted subwoofer, luxury leather-trimmed seating surfaces with dual heated front seats, front-mounted fog lamps, power-adjustable and heated exterior side mirrors, and a six-disc, in-dash CD/MP3 changer with USB integration.

In October 2006, Cheryl Catton, director of car marketing and retail integration for Chevy, confirmed that a high-performance variant of the HHR would be built.

[9] The vehicle was expected to be released with SS moniker for the 2008 model year and use the Ecotec LNF turbocharged engine found in the Pontiac Solstice GXP and Saturn Sky Red Line.

The SS Turbocharged features a 2.0 L (120 cu in) turbocharged Ecotec LNF I4 engine and intercooler that produces 260 bhp (190 kW) (235 bhp (175 kW) with the optional 4-speed automatic), race-tuned high-performance suspension, five-speed manual transmission with short-throw shifter, standard four-wheel antilock disc brakes, ground effects with unique front and rear fascias, aggressive black cross-mesh grille, liftgate-mounted aero spoiler, an analog A-pillar-mounted titanium boost gauge, leather-wrapped steering wheel with mounted audio controls, and unique 18 in (460 mm) high-polished aluminum wheels.

[citation needed] In the fourth quarter of 2010, Chevrolet announced that the HHR would be discontinued after the 2011 model year, with the last HHRs available in dealerships starting in late January to early February.