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Heritage High Roof is what HHR actually stands for. It's pretty self-explanatory, but we get paid to fill this white space. By heritage, GM means the 1949 Chevy Suburban echoed in the HHR's bulldog face and baggy fenders. The roof actually looks low from the outside, thanks to pillbox windows seemingly cut by a hot rodder's torch, but it's not.
2008: Chevrolet HHR SS Turbocharged. The 2008 model of the Chevrolet HHR came with one of the most powerful upgrades in the model's history. The 2008 Chevrolet HHR SS Turbocharged debut with a 2.0L turbocharged Ecotec LNF I4 engine and intercooler that is able to produce up to 260 bhp.he Chevrolet HHR started as a show car for the 2005 Los Angeles Auto Show until it became an SUV built to fit the American driver's need for space and speed. With a fuel economy of 32 MPG, the HHR was the best in its class when it came to fuel economy during its debut.