I cant help you with the slip ons, but I have the Power Ports and the quality and fitment are top notch. I plan on getting the Cobra Powr-flow mufflers soon.
I have Cobra Slash cut on my 2014 FLHTK. Not real loud which is nice after the Rinehart Tru Duals on my 05 ultra. I think it is a nice rumble and you can hear the radio if you want.
I have the Cobra Power Port Head pipe. It is very high quality and the fitment is superb and it is a great performer . It was the easiest pipe I have ever installed by the nature of the design. and you cant beat the price
have the cobra tri ovals. I personally like the looks and the sound is what I was looking for nice bark when on the throttle but not to loud on the highway. sounds even better now since adding true duals
I have Cobra head pipes and Cobra Tri Flo slipons and love the sound and performance. Also have screamin eagle air cleaner and have had the bike tuned. It runs like a beast and has a deep base thunderous sound without the extremely loud clapping. No offense, I just don't prefer the ear pearcing clapping from exhausts for my touring rides. I'm in a '14 Limited. Love these pipes!!