Like I said, why do some do it and some don't?
If it is making this sound and is "in spec" just the same as a focus which does not make the sound is in spec, well that is piss poor engineering/quality control.
People don't want to hear unusual sounds with a brand new car even if it is "in spec" especially, like I said, not all of our cars do this. Simple as that.
Mods: Drop in K&N filter, Steeda RSB, MS3 RMM, Remote start, Llumar tint, Ti engine cover, Husky floor mats, OEM splash guards