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Had a poke around, and the larini rear cans are completely empty, with the twin pipes simply stuck through a short distance into the side, that is it, no perforations, no wadding, no baffles, absolutely nothing!
So would be certainly interested if the valved ones are the same....
If so, you have noisey...2 holes for the exhaust gases to escape, if quieter...1 hole for the gases to escape.
Simple as that?!
Isn't that what I said earlier in thread? The valves simply shut off the inside pipes therefore sound escapes from 2 out of 4 pipes. Crude but simple