Guys recently my 90hp has developed a strange "whine" like a high speed turbine rotating. This starts of at around 50km/h and with the increase in the speed the pitch of the sound too increases . After around 80kmph it merges with the other in cabin noise but is very much there . When the foot is removed from the accelerator and the car decelerates the sound again comes up and becomes audible after around 70kmph and gradually decreases in pitch and finally goes away below 40kmph ; as if some motor is gradually decreasing in spinning speed. At first I thought it is coming from the engine so I did a small trial. Found a deserted stretch of road . Accelerated my car to 90kmph and then brought the gear to neutral and switched off the engine ; and let the car decelerate on its own ; but the strange whine still came up like it was coming before. It sounds like some "poor mans F1 engine sound " . Note that all through the AC is switched off , the music system is off and all the windows are closed. Can anyone throw light on this ? Can it be due to some problem in the bearing/tyres ? I have done 21K kms on my car. This sound has developed around a week back and a number of my friends have confirmed my observation. Thanks in advance!!