Didio had them put on before I left the dealer not to loud but stock is a honda sound and dont want a honda sound for a harley price. I need everyone and myself to hear the Hog breath! Screaming eagle performance is great Ive seen after markets that spit over rich fuel out the exshaust and lose power. I would consider true duals after the slip-ons wear out and the motor needs rebiult. Have 35000 on my 05 standard EG love it...