Is it sedan, wagon, or a SUV? Well I would say none of them. Some cars defy the definitions and 2006 Chevrolet HHR Sema Edition is one of them. The car is fitted with Ecotec 2.2-liter four-cylinder engine that delivers 270 horsepower (201 kw) at 5600 rpm. The concept car gives great fuel economy with low exhaust emissions. Other important...