Shannons absolutely require Skylines to be garaged. And I guess anything else that they feel has a higher theft interest level than less .... wantable? .... things like Falcons and Libertys.
I had a 3inch varex mid muffler with a rear cannon. It was quieter closed but it wasn't enough to pass a DB test which are very strict. Still needed a silencer as well. So they do work but they are also not magic.
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