It may be that the one that I heard had the street pipes on it, but I think that it was more the absence of bass, that roar and rumble of the V-twin sound that I had stuck in my head was more of what I was expecting.
I think that if I had to describe it, I'd say that it sounded like there was a very angry Tasmanian Devil trapped in the engine.
I also think that I probably would have sounded better racing by at 100+ mph rather than at idle and at low speed. There's no denying that it certainly sounds like a healthy race bike though.