Mine is smoother sounding probably because it is a more modern Mercedes engine, but is similar. It sounds like a cross between that and this:

http://youtube.com/watch?v=pYgw8Rm24e0

But not as loud. It does sound like it has more cylinders or is revving much higher. In park or neutral you can rev it and it sounds like you are hitting 8,000 rpm but you cannot go over 4,000 rpm without having the car in drive. Ansa just has a way of making the engine sound like it is turning twice the rpm's it really is. For decades Ansa is the system that gave Ferrari its sound.