uploaded a sound file to this site. (didn't know how else to do it since it's not a video)
This was at 218 mi. I started it up in the morning. The idle was high as it was cold, once the idle settled down, you can hear a clear difference. I assume it is what everyone is talking it about.
https://www.opendrive.com/files?OV8yMDMyOTMxX21qR2hF