Back from testdrive: 
Seems like the phenomenon is below 1500 rpm at high gear.
No difference with or without SPORT.
Spoke to a couple of owners that seems to have the same problem. 
Dealer says itīs normal!  
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2005 /// M5 Silverstone/Black - ITīS HERE! 67.000 km, HARTGE exhaust + POWERPIPE, 21" and HARTGE lowering kit, 318 km/h!
2007 330xdAT TiSi / Black leather. Remap = 275hp, 600Nm!
2004 545iA, TiSi/Black, all options -SOLD!
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