Noisy UTV. Kolpin stealth muffler?

[Johnb317]

Friend of mine bought a Polaris Ranger 500.  Nice rig, but need ear plugs as it's so loud.  Probably scares any critters away for miles!   
Any ideas on how to quiet it down?   Anyone use the kolpin stealth 2 bolt on muffler?

Hate to tell him I'd rather hump quarters on my back than start that sucker up and ruin whatever hunt for everyone else.

Thanks