Stock Modena sound
http://www2.csc.ne.jp/~ferrari/360normal.mpg

Modena with replaced exhaust system
http://www.kreissieg.com/report/sound/uruhu-6-2-hasin-001-01.htm

As far as I am concerned, I think the latter sounds so much better. But of course, it is matter of taste. The difference between the above is just the exhaust system.