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STi 04-07
Naturally aspirated flat-four (boxer) engines comprised the 1.5-liter EJ15, the 1.6-liter EJ16, the 2.0-liter EJ20, and the 2.5-liter EJ25. Turbocharged versions of the 2.0- and 2.5-liter engines were offered in the WRX and WRX STI models. STI models featured a more powerful 2.0-liter (2.5-liter outside of the Japanese market) turbocharged engine. WRX models featured a 2.0-liter turbocharged boxer engine until 2005, after which they switched to the 2.5-liter turbocharged engine.
Naturally aspirated flat-four (boxer) engines comprised the 1.5-liter EJ15, the 1.6-liter EJ16, the 2.0-liter EJ20, and the 2.5-liter EJ25. Turbocharged versions of the 2.0- and 2.5-liter engines were offered in the WRX and WRX STI models. STI models featured a more powerful 2.0-liter (2.5-liter outside of the Japanese market) turbocharged engine. WRX models featured a 2.0-liter turbocharged boxer engine until 2005, after which they switched to the 2.5-liter turbocharged engine.…
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