I put MGS slip-on's on my RKC. They sound great; throaty but not too loud. Finish is great, and the black tips are awesome looking and easy to clean. I ordered a set of "blem's" and saved some money, and only one pipe had a very small blem which is invisible the way I installed that pipe. Good company to work with; American owned & products made here too.
Give them a look.
2012 Road King Classic
"You're flirtin' with Time baby. You're flirtin' with Time but maybe, Time baby, is catchin' up to you."
- Tom Petty