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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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