The 2018 X3 M40i replaces the standard car’s four-cylinder turbo for a turbocharged inline-six that makes 355 hp and 369 lb-ft of torque. This gives the M40i a notable 107 hp over the X3 xDrive30i. But it’s important to note that this is not a full-blown M car like, say, an X5 M. Rather it’s a BMW that’s been massaged by the M division with a slurry of added parts and tuning meant to sharpen all aspects of the driving experience. What this means is that M has enhanced the driving experience here but not as thoroughly as it will when it rolls out the promised X3 M later in 2019. Yet letting the M division shape its magic into the X3 makes a lot of sense because most agree that, unlike some of BMW’s current car and SUV offerings, the X3 has embodied BMW’s core driving dynamics ever since the gen-one vehicle went on sale here in 2004. So yes, take your already well-driving crossover and make it louder, faster, and handle better. And in doing so, become directly competitive with Audi ‘s SQ5 and Mercedes ‘ GLC 43.