Heard it externally for the first time today, while mechanic took it for test boot.
Very happy with the sound
I'm surprised how relatively low and rumbly it can be, I was expecting much shriekier
Puddling along at 55km/h in 5th or 6th sounds nice, not obtrusive at all above 85km, nice for commuting. If I want to reduce the noise between 55-75km, I use 4th gear. I love the gear changes too, and I definitely recommend this inexpensive mod for manual users
Will get around to posting video when weather better