An air filter system is provided for a vehicle. The air filter system includes, but is not limited to a raw air duct, a filter housing with an air filter element, and a filtered air duct to an internal combustion engine. The raw air duct and the filtered air duct are connected to a corresponding raw air inlet or a filtered air outlet of the filter housing. The air filter system with filter housing and raw air duct is disposed as a structural unit partly in the engine compartment and partly in an air intake region separate from the engine compartment. An adapter of the air filter system supported on the bodywork of the vehicle is disposed in a transition zone from the engine compartment to the air intake region.