One of the most anticipated additions to the 2011 Shannons Nationals game-card is Radical, the twin-seater open cockpit sportscar prototypes that have been taking Australia by storm over the last couple of seasons. For the first time the Radical Australia Cup will be conducted as a five round series within the Shannons Nationals, featuring a variety of endurance formats including ‘bi-duro’ (twin-50 minute races) events.