The stock exhaust is probably the quietest you are going to find, then add a silent rider if needed.
If you cruise e-bay and classifieds, maybe you can snag a nearly new stock muffler from someone who's switched to aftermarket...
680 Rincon camo, Foreman headlight, Warn XT30, Guru bumper
500 Foreman, Warn 2.5
Patio Hauler 394F 5th wheel toyhauler
Dodge Ram 3500 Laramie dually w/jake