OWNER DROVE THE 2003 VOLKSWAGEN PASSAT (2.8 V6 ENGINE) HOME AND PARKED IT. HE CAME BACK OUT TO THE DRIVEWAY APPROXIMATELY 2 HOURS LATER AND FOUND THE VEHICLE SMOKING. SMALL FIRE AT RIGHT FRONT FLOOR PAN/MINOR MELTING OF DASH PLASTICS CAUSED BY HEAT FROM RIGHT SIDE EXHAUST PIPE/CATALYTIC CONVERTER. HEAT SHIELD MELTED, RUBBER BODY PLUG IGNITED AND CONSUMED, CARPET JUST ABOVE BODY PLUG WAS CHARRED. CAR JUST HAD RIGHT SIDE CATALYTIC CONVERTER AND PIPE REPLACED. *TR