Shout Out the Group 3/4 Crew

Here is a great looking Porsche 911 photographed at the Cavallino Classic track day at Palm Beach International Raceway, Friday. Is this a Group 3 or 4 rally car or is it from another class of racing?

Authentic looking reproductions are very cool; a friend wants to make a tribute 911 Group 4 rally car in nasty 70′s livery – this car is too attractive in the Martini & Rossi colors