Polaris Outlaw 500 Exhaust...Which one?

[OutlawVJV]

I ride a 2006 polaris outlaw 500IRS and im looking to upgrade the exhaust. I was looking for a slip on that gives the most extra power. However i know alot of brands you are paying for the names as well. Does anyone have any suggestions on a type of exhaust that will do the trick without paying so much. And if money wasn't an issue which one would be the best?

[beltburner]

i have the hmf oval pipe and it makes good power but it is so loud it really pisses off other riders