The BMW X3 M40i is a high performance version of the BMW X3 SUV. It features a 3.0-liter turbocharged inline-six engine with 355 horsepower and 369 lb-ft of torque, allowing it to accelerate from 0 to 60 mph in 4.6 seconds. The X3 M40i also comes with an M Sport suspension, M sport brakes, and an M Sport differential. It also includes an 8-speed sport automatic transmission, all-wheel drive, and a range of other performance enhancements and features.