This 500+ horsepower 2007 Subaru Impreza STi unleashes an unforgettable turbocharged boxer soundtrack thanks to its EJ25 ...

Although fans and owners of the WRX STI hoped that Subaru would offer the 2.0-liter turbo flat-four in the STI S209 for North America, the Ebisu-based automaker didn’t make their wish come true. The ...

The EJ25 boxer engine's head gasket failures became so predictable that mechanics could diagnose the problem before owners finished describing their symptoms. The specific flaw traced back to a ...

Japanese oil company ENEOS displays five modified race cars at this year’s SEMA Show, with the Porsche 911 GT3 STI as its most ambitious project. It’s again an engine swap, replacing the iconic ...

When Subaru announced it was bringing an S-series WRX STI to the US for the first time, we wondered what engine would power it. A turbocharged boxer-four, obviously, but the Japan-only S208 used a 2.0 ...

Overboosting. A turbocharged engine's worst nightmare and root of disaster that claimed the life of millions of healthy engines around the world. Rewind the clock back to 2010 when my '05 Subaru ...