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Old 07-28-2008, 10:38 PM
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Location: rural, AB, CANADA
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Default RE: Scratch made muffler

Here are the two I have used on an OS-37 that read 84 db @ 9 feet in the hover at 1700 rpm and that produce very good power while leaving the needle settyings very user friendly

1 - the Century CN3037 - surprisingly good for its low price (around $40.00)

2 - the KSJ #1545 - though it measures the same on the SPL meter and prvided the same power, it did sound a bit more mellow (around $80.00)