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Tack weld a washer with a smaller diameter hole than the muffler has now(if your runnning open pipes) an inch or so inside the tip and it will quiet it down real nice. How quiet you want it is dependent on the diameter of the hole in the washer.
Friend of mine has his busted CB450 in my garage right now; he coincidentally came over with a set of the same muffs the other night. Once he gets his ignition sorted we will see what they sound like.