I own a 2023 ZL1 with 830 miles on it currently. Have the OEM Supercar 3's and they make ZERO road or drone noise at ANY speed(At 30psi). I also had the factory exhaust for about a year with zero drone, then put Flowmaster American Thunder Axle-Back Exhaust on it and also have ZERO drone. I have a K&N cold air intake and while i hear the supercharger whine a bit more than the stock air box, there is by no means any drone. I'm sure that doesn't "help" you and I'm sorry. I'm just giving you my experiences with my car and what I've done.
. I hope you are able to figure out what is causing it.
