The closer you can put the muffler to manifold the less stress it puts on a manifold. Another thing is having the longest piece of pipe possible after the muffler that you can also make it quieter. There is also a thing as a muffler with too much airflow for the size engine it's on. A more restrictive automotive muffler can actually increase air velocity in the exhaust system so instead of just having the piston pushing the exhaust gas out on the exhaust stroke the increase in air velocity can help suck out more exhaust gasses, and help draw in more air (and fuel with a carburetor) when the exhaust, and intake valves are in overlap. Which in turn helps the engine make more power.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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