M103 Years:1953-64 Vertical Two-Piece Muffler And Pipe With Clamp. Custom Design Ready For Assembly. Pipe Inlet 1-5/8 I.D., Outlet 1-3/4 O.D. For 134 CID Gas Engines. Tractors: NAA, 501, 600, 700, 2000 (4 Cyl, 1953-1964). 172 CID Gas Engines. :THIS ITEM IS EXCLUDED FROM THE $99 SHIPPING PROMOTION: