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I had rush 1 3/4" slip ons on my 2008 (96 motor) Dyna fxdb..they sounded good...I have fuelmoto slip on on my 11 roadking (103 motor) and they sound better..more lower notes and less high notes...just a nice low rumble...I am not sure but it might sound different because of the different motor size...
question on different size baffle deals with the inlet side of the baffle in many cases. this is done to offer back pressure. Most pipes from one manufacturer have the same outside diamiter, its the baffle size at the inlet that they sell the size numbers for customers. If you have a fuel injected bike the back pressure from the smaller inlet gives the O2 sensors the adequete slow flow to read and send back the millivolts to your process controller for fuel air mixture.