@moodyhank You are right. I had no idea until now thanks.
Apparently I wasn’t the only one under the impression it had a twin turbo engine. Some well known car magazines and blogs also made the same mistake and reported the engine as having twin turbo chargers.
Kelley Blue Book
"The 2018 X3 xDrive 30i is powered by a 2.0-liter twin turbocharged 4-cylinder engine rated at 248 horsepower and 258 lb-ft of torque. The sportier X3 M40i boasts a 3.0-liter twin turbo inline 6-cylinder engine producing 355 horsepower and 369 lb-ft of torque."
MotorTrend
"BMW has announced two trim levels for the new X3: xDrive30i and M40i. The first model comes paired with a 2.0-liter twin-turbo inline-four producing 248 hp and 258 lb-ft of torque, up 8 hp from the outgoing xDrive28i. With this engine, the X3 can hit 60 mph in 6 seconds and a top speed of 130 mph, according to BMW estimates."