i'm running non-sport... and i haven't noticed any "shoving around" at highway speeds (and i never do less than 70mph)

very stable, even in the rain with some wind...

no howling either...

then again, eventhough it's winter here... cold, windy weather hasn't really hit us yet!

test the wheel alignment.... on a completely straight and somewhat bumpless/potless road, drive for a few seconds, take your hands off the wheel and brake slowly...(don't slam on it)

see if the vehicle steers heavily into one direction...

note: depending on the roads imperfections it will steer slightly off-center.. but concentrate on the "immediate" steering...

i believe you would also experience vibrations on the highway if you really had issues with wheel alignments.

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2012 X5 50i M-Sport
2014 X3 35i M-Sport