Long after Volkswagen gave up on the boxer-four engine configuration, Subaru keeps getting more and more power out of the design with their EJ engine series. Starting in 1989 and continuing through the present day, the 4-valve-per-cylinder EJ has been made in SOHC and DOHC form, with displacements ranging from 1.5 liters to 2.5 liters. Power outputs from the EJ run the gamut from double-digit figures to "How much money you got?" with the WRX versions reaching the magical 300-horse figure right from the factory. [Wikipedia]

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