A car comprising a car body and a rear spoiler that projects from the outline of the car body to deflect the air flow upwards so that the air flow skims over an upper surface of said rear spoiler. The rear spoiler comprises a through aerodynamic duct, which starts in an inlet opening arranged in correspondence with an initial end of the rear spoiler and ends in an outlet opening arranged in correspondence with a final end of the rear spoiler, so that a part of the air flow hitting the rear spoiler flows above the rear spoiler, skimming over the upper surface of the rear spoiler, and the remaining part of the air flow hitting the rear spoiler flows through the rear spoiler crossing the aerodynamic duct.