Supplementary mudguard for automobile

A supplementary mudguard comprising a rigid member which is adapted to be mounted inside the mudguard proper of an automobile, characterized in that, in order to produce a uniform and efficient flow of air in the space between the supplementary mudguard and the mudguard proper, the rear end of the supplementary mudguard is bent to extend underneath the car floor essentially in the direction thereof to form an ejector-like passage between the car floor and the supplementary mudguard, and wherein the outer edge thereof is provided with at least one elastic fastener formed as a double clip for engaging the edge of the mudguard proper and the edge of the supplementary mudguard, the clip engaging the mudguard proper being stiffer than the clip engaging the supplementary mudguard, the clamping force between the fastener and the mudguard proper thus being greater than the clamping force between the fastener and the supplementary mudguard.