I've got the V&H Monster Ovals on my 09 RK. Along with the fact that Ilike the way they look, I like the low rumble they give without being too loud. I also have the Power Duals on mine.
Love my Rinehart Racing pipes - nice rumble, but I can still hear the stereo w/no distortion. Of course, didn't hurt to swap stock HD speakers w/HogTunes either.
Yep whats good for one may not be for another. I just installed dresser duls (head pipes) and V&H Fishtail slip ons,, LOVE the look and sound,,, perfect for me...