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i had them on my last road king. sound great,no doubt. a little louder. lost some bottom end torque with my ev23 cam but picked up some power in the higher rpms.
I think the heat dissapation for passenger# 1 and better exhaust for rear cylinder helps to run cooler added with stage one the bike breaths alot better but you will lose low end torque for sure. I think the sound is probably #1 issue with most and true duals just look Bad ***!
It all depends on what you are trying to get out of the bike. You can go with true dual for the sound and put a better cam kit in and not lose the torque. But if you go with a true dual try and get the largest pipe size you can get.