How many movies have Marcello Di Paolo and Stelvio Cipriani collaborated on?

They have worked on 6 movies together! Their first movie together was Le Mans, Shortcut to Hell (1970) while their highest rated movie together was I due della F. 1 alla corsa più pazza, pazza del mondo (1971). They have not worked together since Papaya: Love Goddess of the Cannibals (1978).