My 2005 Outback 5 speed wagon sounds like an airplane on the highway.
It is making a whuuuwhuuuwhuuuooo noise that stays consistent with the speed of the car - clutch in-out does not effect it.
BUT it does sound different on different pavements - don't know if this is echo or?
Could be newer tires, but they are Michelins, about 1 year old, set of four.
I've been told it could be wheel hubs, but it sounds too even - I have sat in the back seat to listen while someone else drove and I cannot pinpoint any one firm direction. I gnerally have very good hearing....
Any one have this experience? Suggestions? Thanks!