Has anyone bought an after market muffler system that is noticeably quieter than the original system? My use is primarily hunting, and the quieter, the better. Recommendations?

Check out arkansasduckhunter.com

Buddy of mine just installed a kolpin stealth exhaust system on his 400 sportsman . His wheeler is so quiet you can barely here it run. I was impressed and it actually gave him a little more top speed. Check it out, if you want quiet this is the way to go.

Do a search in these forums for "Benz ATV silencer".

I have one installed on mine and I love it, quietest ATV in my area.

Let me know if you would like more information than what you can find. I can also take pics, etc.