2220458 Muffler Fits CAT Fits Caterpillar 953C 963B 963C Crawler Loader Early S/One New Aftermarket Replacement Muffler Fits Caterpillar (Fits CAT) Crawler Loaders This aftermarket replacement muffler Fits Caterpillar (Fits CAT) 953C, 963B, and 963C crawler loaders. Designed as a direct replacement for the exhaust system on early serial number machines, this muffler restores proper engine exhaust flow and back pressure. Important: this is the early low serial number 953C muffler the plain 953 and late S N 953C use a different