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No there isn't a silencer for the PS2. I don't even find it necessary, just put the PS2 in some kind of TV cabinet (with lots of ventilation), it blocks out all the noise for me.
*Don't really shove a screwdriver into your PS2. I know you're not stupid, but I really don't need to be sued right now!
There is to my knowledge you can do about it.
I'd almost definately say you can't do anything to make it quieter. It's unfortunate, but we'll just have to live with it.