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sport line = sport package, which includes Passive M suspension. You're pretty well equipped, but far from "fully loaded." Go on BMW's website and do the "build your own" to see available options if you want to see what you do/do not have. That said, you have it, I wouldn't bother worrying about what you don't have.
As far as the suspension, do a search on here for Adaptive M Suspension, plenty of info on that, part of the dynamic handling package starting in 2013. Allows you to adjust the suspension, which also means in Sport mode it is stiffer than the passive M that comes with the sport line standard. More to it than that but bottom line is that is the option for stiffest factory suspension, Adaptive M suspension in sport mode.
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