2011 Subaru Impreza STI GVB Part 3

In our last STI GVB Test & Tune, we increased the EJ257’s operating efficiency with a bolt-on intake system, a high-flow downpipe, and an exhaust system. These bolt-ons netted a peak horsepower gain of just over 31 horsepower but revealed the limitations of the factory intercooler system as the power […]

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