How Subaru Made Their Most Powerful Engine Ever
The Subaru STI S209 is the first time America gets an exclusive S Line Subaru STI. With a bigger turbo, revised intake and exhaust, new tune, and water injection system, the car now puts down 341 horsepower from its 2.5L boxer EJ25 engine. Forged pistons and connecting rods ensure the engine is up to the added pressures, and wider 265 bespoke tires all around, combined with Subaru's DCCD AWD system ensure the power is put down without a fuss. Here's how Subaru made their most powerful engine ever.