That flutter seems similar to what the BOV adapter sounds like in BMS' product video. It reminds me of 90/00s era turbo cars. The BMS video shows the recirculation pipe shaking a bit, so maybe there is a problem with the wastegate/turbo on their car...
Update: BMS said they were supposedly...
Just noticed this issue on my 2023 2.3 7MT. Has anyone had success squashing the issue by replacing the oem BPV with either another oem part or an aftermarket piece?