GM has been adding gears to automatic transmissions , reducing the weight of its powertrains and designing engines capable of being mass produced with high - tech features such as direct fuel injection and turbochargers . The template for GM 's future engine strategy is already on the road in cars such as the Pontiac Solstice GXP and Saturn Sky Red Line . The engine used in those roadsters is a 2.0-liter four - cylinder with direct fuel injection and a turbocharger . Horsepower is 260 -- the most per liter of any production engine GM has ever made .

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