The invention provides a sound-insulating part for a motor vehicle having
an engine compartment and, beside the engine compartment, a clearance
volume for accommodating vertical travel of a wheel of the vehicle, the
part being characterized by the fact that it is arranged to form a sound
screen between said engine compartment and said volume. The invention also
provides a mudguard constituting such a sound-insulating part and a side
module made from such a mudguard.