My civic reborn 2007 gives out a noise at high speed. The noise becomes louder as the speed goes up. It really starts to be obvious at around 75Km/h. It's like a "Hmmmmmm" sound. At slow speeds, the sound becomes minimal and the engine is totally quite when the car is stationary.
I thought the noise was due to wheel bearings and got them replaced the but the noise is still there.
Has any one else had a similar problem with their reborn? What could be the reason behind the noise?