the center of the engine area.? It gets a little louder as I speed up, and is really loud when I let off of the gas. I tried turning the wheel right and left, and it did not change the noise. I can feel vibration in my foot while it is on the gas pedal and drifting. I have had universal joints bad before and it sounds similiar. I have also had bad wheel brgs before and it does not sound the same.