How does the Variable Valve Timing on a modern Ferrari work? On most car it is the intake cam the moves either mechanical or hydraulically. On a few cars both cams move. I know on Ferraris only the exhaust cam moves. What is the advantage to this, how is it controlled, and when does this come into play i.e. at what RPM or is it continuously variable? Also the Pop valve on the exhaust of the 360 Challenge Stradale how does it work and what is it for? It does make the car sound great when it opens. But what does it do besides esthetics? Yamaha uses something like this on there motorcycles they call it an Ex-Up valve. Im wondering if it is used for the same thing.