Had Vance & Hines Dresser duals fitted to my 2014 FLHTK and they have made a significant difference to sound and performance. I have them mated to Screamin' Eagle Street Cannon fishtail slipons and they sound great now - they were a little too quiet with stock headers.

 

Very happy with the improvement.

Link to videos of before and after fitting the headers

http://www.hdforums.com/forum/touring-models/998495-as-promised-before-and-after-videos-of-vance-and-hines-fitting.html

 

 

I have ordered the Vance and Hines Power Duels with the Hi Output Carbon Fibre tip mufflers for mine.