"Audi", "quattro" the four rings and Audi emblems are registered trademarks or trademarks of AUDI AG, Germany. "A8," "A4" "S4," "S6," "200," and "5000" are trademarks of AUDI AG, Germany. "Porsche,"the Porsche marque, "Carrera," and "Boxster" are registered trademarks or trademarks of Dr.Ing.h.c.F.Porsche AG, Germany. Dr.Ing.h.c.F.Porsche AG is a company registered at Stuttgart, Registriergericht HRB 5211. The Monobloc concept is patented by Porsche.