Quote:
Originally Posted by Triple Jim
I can't tell for sure, but it looks like without the extra silencer the exhaust comes though some perforations and out the exit. The insert appears to make the gas go back toward the engine through a fairly tight clearance to get into its tube.
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If the insert is open-ended, it just shortens the baffled part of outer canister that's used. Gas entering inlet would take least-restrictive path, so sections on outside next to insert just won't be used because pressure on either side of baffling is balanced. So it basically shortens muffler and only section before insert is used.
Lemme draw picture...