I just purchased 2021 Levante S GranLusso. It's great!! Only annoying problem is the dreaded "drone" noise that occurs at cruising speed when in Normal mode. I have noticed it only occurs under load at certain RPMs: 1400 - 1900 rpm. I have done some research and looks like it's a dreaded noise that comes with performance exhausts. Has anyone experienced this drone sound? If so, how did you resolve the issue? Thank you in advance.