I was ready to pull the trigger for a new set of Fatshotz (80847-10) Slip-ons with open end cap for my 2010 Ultra Limited when I looked in the P&A catalog and saw the Nightstick (64900093) 2 into 2 Diffusion Disc Slip-ons with Closed end caps. Both of these are 50 state legal and EPA stamped. I believe the Nightstick 2 into 2 is new and I have not seen any thread posts from anyone using these. There are lots of posts about the Fatshotz and most are favorable. I would appreciate any comments from anyone that may be using the Nightsticks.