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The 2018 Porsche Império GT3 Cup Challenge Brasil is the first one-make Porsche racing championship in South America for 911 GT3 Cup cars and this was the fourteenth season. It began on March 24 at Autódromo Internacional de Curitiba and finished on November 11 at Autódromo José Carlos Pace. It was first held in 2005 and follows the same formula basis used in the Porsche Supercup and Porsche Carrera Cup championships held around the world.