The most luxurious BMW sedan just got a serious upgrade under the hood. While it may have received a refreshed interior and exterior, the flagship BMW sedan is now powered by a turbocharged four-cylinder and an electrified six-cylinder turbo. Starting with the inline-four model, the 730i is powered by a TwinPower Turbo four-cylinder that puts out 265 PS and 400 Nm of torque. Meanwhile, the more powerful 745Le plug-in hybrid gets a six-cylinder TwinPower Turbo that is helped along by an electric motor and battery pack. It has a total system output of 394 PS and 600 Nm of torque. Both connected to an eight-speed automatic Steptronic transmission

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