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Thats a bit hard to say without hearing your tractor..... is the original muffler one of those little shaker pots? or is it an actual can style muffler? Even when new the shaker pots are not as quiet as a can style muffler that is still in good condition.... altho the inside of the cans are often rotted out long before there is any visable holes ithru the outside of the can.
a good trick with a shaker pot is to add an elbow so that it faces as far away from the operator as possible because the sound from those pots is very directional.
the K engines, when new, actually have very little mechanical noise but after 40+ years of service most now have alot of engine rattle which is magnified if the engine doesnt have rubber mounts.. in some cases the mechanical noise is actually louder than the exhaust itself... and that is more common with the 321/341 engines than it is with smaller Ks... the bigger pistons caused more wear over time which causes the engines to rattle more... and that is also why busted con rods are far more common in the 321/341s than any of the smaller Ks
my point being: If you want a quiet K series engine you should start with an engine rebuild.
a good trick with a shaker pot is to add an elbow so that it faces as far away from the operator as possible because the sound from those pots is very directional.
the K engines, when new, actually have very little mechanical noise but after 40+ years of service most now have alot of engine rattle which is magnified if the engine doesnt have rubber mounts.. in some cases the mechanical noise is actually louder than the exhaust itself... and that is more common with the 321/341 engines than it is with smaller Ks... the bigger pistons caused more wear over time which causes the engines to rattle more... and that is also why busted con rods are far more common in the 321/341s than any of the smaller Ks
my point being: If you want a quiet K series engine you should start with an engine rebuild.