ATV Performance Modifications 850 looney tuned slip on exhaust June 16, 2015 I have a polaris sportsman 850 xp and I put a looney tuned slip on exhaust on it. It is snorkeled and when I get in water now it wants to cut off I’ve never had a problem with it until I put exhaust on. Do I need a power commander? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related