The Centenari Mac3 was a Le Mans Prototype, originally built by Centenari in 1998 for the CN category of the International Sports Racing Series. It was updated in 2006, and the new version was renamed as the MG3. Both cars used the same naturally-aspirated 3.0 L Alfa Romeo V6 engine. The Mac3, in conjunction with the older M1 model, helped Centenari to take joint-second in the 1998 International Sports Racing Series CN Team's Championship.