Muffler, horizontal exhaust. Inlet 2 inch I.D. outlet 1-7/8 inch O.D. 17-1/2 inch overall length. Ford 4 Cyl gas Tractors: 801, 901, 4000. Vertical exhaust for 144 CID diesel engines. Tractors: 501, 601, 701, 2000 (4 cyl, 1958-1964)