Supercharger will only whine if you get the stillen kit = not much hp. I advise people not to jump head first into fi. But might b worth a gamble (havnt looked at the link yet).
Drones at 60mph in 6th, as said above. Quality is great, sound is nice and meaty/burbly below 3500rpm then gets a bit raspy. I run silenced decats tho so might b a bit louder than with cats. Not for everyday with my setup.