[Btsfrankee]

I have a 2018 440i GC. I went to put gas and when I started my car back up, I accelerated and all of sudden heard this rumbling from what sounded like the inside of my car. Behind me, sounded like it was coming from the trunk. The harder I accelerated the more intense the noise got. But you couldn't hear it from the outside, just from the inside. And only when I pressed the pedal harder, if the car was just coasting no noise, soon as I pressed the pedal, rumbling like it was from the exhaust. Few screeching noises as well. Sound familiar to anyone?