Description Vertical muffler for diesel tractors, fits engine D310. Inlet I.D. 2-15-16", outlet O.D. 3", length 40", diameter 6" round body. Tractors: 706, 756, 2706, 2756. This item is a suitable alternative for the following: 398512R2, 398512R1, 398512R91, IH-17, IH17