Many years back (high school) when I heard the name "Turbo Mufflers", I thought they must have a Turbine Wheel inside that would spin to reduce noise, yet be less restrictive. Never tried cutting one open.

Of course, the name instead referred to mufflers used on Turbocharged Chevrolet Corvairs, designed to be less restrictive.

Also, what about "Muffler Bearings"?

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