Depends on what you are looking for, and remembering that sound is different for everyone. I have a 2010 FLHTK, I was looking for a nice low rumble, but not too aggressive so I could enjoy the ride and tunes. I went with Vance and Hines Power Duals with V & H Hi Output slip on's (I also did a stage 1 and PCV). I am very happy with the results, other than scraping the xpipes on a really aggressive lean. If you are looking for something louder then Rineharts may be your answer....the best thing to do is try and listen to several pipes before deciding if that is a possibility.