This happened to me when I pulled in for gas one time. I was in my "glasspaks" phase with my 2K Interstate, the "Blue Babe", and she sounded kind of like a small block Chevy at idle.
I get done fueling and an old timer walks over to take a look at her and tells me it looks nice.
I thanked him and he keeps looking at it and finally notices all those header pipes and says:
"Does it still have the Harley sound?"
I kept a straight face and told him "No, it sounds a bit different now."
"Well, it sure is a pretty bike."
He climbed into his RV and I could tell he was checking the sound as I left, revved it a few times for
him.
Makes me wonder if he ever figured out what model of Ultra Classic it was!

******
I had another guy one time ask me what kind of Harley it was and I told him I couldn't give specifics, because it was an experimental model on a long term road test.

Every copier is a Xerox machine, all tissue paper is Kleenex, and anything on 2 wheels is a Harley. LOL
Ride safe.