I am two months into owning my first BMW, a 2017 550i GT xDrive with lots of options and I found I don't know a lot about my car. It's a blast to drive in Sport mode, but this doesn't make it an M550i, does it? The only place I noticed the M logo is on the steering wheel. I doubt I'm missing much in the way of performance, but I'd like to know anyway. Just what does the mSport package do ?