RE: "ATV Silencer"
I've had one on my Polaris 500HO for 3 years now. I would say it makes a noticable difference, but if you think you are going to slip into the woods undetected, forget it. It makes for a quieter ride, but I almost think it's more for my own comfort rather than for getting closer to game. They know I'm coming way before I get there.
I got mine from Cabelas bargain cave for $60, regularly $200.