I'm driving to the post office at lunchtime, if you listen carefully you'll probably be able to hear it. The bungs are in, so you might need to open a window or go outside..........
I've pretty much kept the bungs in since I got it, several people have commented that its a nicer noise with them in and I agree. Had a nice drive yesterday from Aberdeen - Arbroath, about 50 miles, and found it very pleasant around 3k rpm, on the way up the revs its louder but on cruise at 3k its easily liveable. Above 5k is mad! I found a lot of rattles when I took the bungs out, the cubby hole would pop open without touching it aswell, due to vibrations. Maybe thats just me.