Ive had my m3p for about a week now and have noticed that the car makes a very high pitch sound while supercharging. Its a hard noise to describe but is a very high pitched ringing sound, like the ringing sound you get in your ear sometimes. It also makes this sound when parked in the morning with the heater running inside to condition the battery. However as soon as I go out and open the door, the ringing stops. Just want to make sure this is nothing to worry about.