My 09 Fat Bob was too quiet with stock pipes. I tried Khrome Werks slipons and love the tines however, my right ear would ring after 20 minutes of riding. Too loud for me. Then I put on the SE slip ons which also had a nice tone but not very loud. Just a little louder than stock. Then I upgraded the motor to 103 and the bike got louder deeper and sounds perfect with the SE. Not too loud , deep tone but loud enough too be heard. In the end it is personel preference.