So...I moved back to Italy a few months ago and my bike arrived last week. The local police are not thrilled with my Cycle Shack slip-ons...Been pulled over twice. I am looking for a set of slip ons that look about the same but are a few dbs more quiet. Any recommendations? I don't have the stock slip ons anymore. I tossed them and kept a set from my wife's old sportster on accident (they were in a box)...

 

The simplest and cheapest solution will be to add DK Custom 'Q' model Thunder Torque inserts to the Cycle Shacks. With the stock baffles in and the 'Q' TTI installed you'll have less sound volume at cruising RPM's and under throttle...

Edit: Here's the fitment guide to help you figure out what size 'Q' TTI's will fit with your Cycle Shack's with baffles installed...

 

You should try the Q TTI's as TinCup suggested.
Other than that the later versions of the Screamin Eagle mufflers will quiet things down, but still a better sound than stock. It's a pricier option, so I would try the inserts first.

 

Good advice from both of the guys above! I put a set of Rush slipons on my wife's Sportster a month or so ago, and they were a bit too loud, plus they had kind of a harsh tone to them. I put a set of the TTIs on, and it quieted the bike down a lot. Plus, it gave the bike a deeper, much mellower tone.