You can definitely put a quieter exhaust on there, but it is more the injection pump that makes so much noise. You know the earlier dodge 2500s with the 6bt? sounds similar to that...
1997 Honda civic DX( all stock DD)
1972 Toyota FJ40(4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)