The HHR is a new model for 2006. There are three trim levels for this five-door retro-cruiser designed to replicate a 1949 Suburban. The LS and LT1 models come equipped with the 2.4Liter Ecotec four-cylinder engine that produces 149HP. Move up to the LT2 and you get the same 2.4Liter engine with 16 valves that increase the horsepower to 172. A five-speed manual transmission is standard with a four-speed automatic as an option.