All of the new Champion bows, including the Contender come standard with the ISO bars on them, they do a very good job of quieting the shot. I set up a guy from work with a Contender for hunting about 4 months ago and it was one of the quietest bows I've heard right out of the box.
You're the first person I've heard that from. Seeing as the Contender and the Mustang use the same limbs and the same cam I don't know where the Contender and the Mustang would be any different as far as noise is concerned.
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