If a 360 Modena revs above about 4000 or 5000 RPM. It's getting a louder noise. What happens then in the exhaust. How come it sounds louder. I hear it myself a severtal times. In some videos i've got you can hear it. For example this one made by myself
http://ferrarievents.tripod.com/PCDV0015.AVI
Whp know what happens above that number of RPM?