WRX. Those three letters tell automotive enthusiasts the world over that they are not dealing with an ordinary Impreza, and it all began in rally racing with a 2.0-liter turbocharged flat-four engine. Though some models – including the current WRX and STI in the United States – had engines displacing as much as 2.5 liters, the WRX earned its reputation with 2.0 liters, and that's the displacement specified for competition use.
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