You are the boss of the 2018 BMW X3 M40i .
A charming mashup of about one part M3 and two parts X3.
There’s a little button next to the shifter, with Adaptive, Eco Pro, Comfort, and Sport modes indicated. Tap to toggle, and the X3 M40i changes things up, morphing into whatever sort of machine you’d like to drive at any given moment. Su