+1 love my Kerker 4" Stouts. Even better that none of my buddies have my exhaust!!!!I have the Supertrapp 4" Stouts on my 2012 Fltru with a Fuel Moto 2-1-2 head pipe . I ordered the pre cat model and just love the sound of them with my 103. I have about 7000 miles on them and I would say they are getting a tad louder as the wrapping burns. Still can hear the tunes going down the highway and a great sound when you get on it. I order up a set of post cat baffles just for shits and giggles and installed them, wow did they make a difference. Too loud for me at my age ,ten yrs. ago I would be smiling from ear to ear.
I have just installed a Fuel Moto 107" kit ,which does a bump in compression and that makes my original baffles sound perfect now.