Michaelt, a big question is how much louder do you want the bike to be. If you want to be conservative, then the Screamin Eagle slip ons might be OK. I put them on my wife's 08 1200 low and she loved them. I thought they were way too quiet, so I went with a pair of Cycle Shack slip on mufflers and was very happy with them. They have lots of different sytles and designs to choose from and are very reasonable in price. I can tell you that performance wise, my 08 1200R would slowly walk away from my wifes 1200 low when riding side by side. I chose mufflers that looked just like the stock ones, so you really couldn't tell they weren't (other than a great sound).