a cavity filler for use in a hollow pillar of a vehicle . the cavity filler includes a carrier having a generally planar upper surface , an expandable foam mounted to the carrier wherein the expandable foam is mounted to the carrier around a peripheral edge of the carrier . the invention further includes a flange connected to the expandable foam wherein the flange extends away from and generally parallel with the planar upper surface of the carrier . the extension and flange of the expandable foam are operable to extend the expandable foam to ensure a full filling of the expandable foam after the heat treating process . the fully occupied hollow cavity of the pillar with the expandable foam blocks the transmission of noise from the engine , wind and / or road noise through the pillars to the interior vehicle cabin .