2019 Detroit Auto Show: Subaru STI S209

© Perry Stern, Automotive Content Experience© Perry Stern, Automotive Content Experience
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Powering this special STI is a reworked 2.5-liter turbocharged Boxer engine that delivers 341 horsepower — a healthy bump from the standard STI’s 305 horses. The HKS-built turbocharger gets a larger turbine and compressor that generates 18 psi of boost, while the engine gets forged pistons and connecting rods that are both lighter and stronger.

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