Anyone out there running 4 ohm speakers on the 2 ohm stock system. I have hogtunes now but a buddy just gave me a set of polk db521's for free and they are 4 ohms. Just wondering if anyone else is running something like this and if it will work.

 

It will work perfectly fine, in theory you would loose 3db of output by doubling your impedance but no speaker is truely a 4, 2, or 8ohms. Try them and see if you like them. Likely the Polk is more efficient which would negate the ohm difference.