In shopping for an exhaust upgrade, it seems like a lot of folks really like the S&S Grand Nationals for the 2018 Fat Bob, and they also appear to be CARB and EPA-compliant so perhaps those concerned about warranty issues might be okay with using 'em. For example, the Vance & Hines page for their upcoming slip-on says "For Competition Use Only", but S&S says the Grand Nationals are " Qualified manufacturer declared U.S. 50-State legal emissions replacement part on all MY 2018 Fat Bob models. "

I've shopped around and it looks like absolutely everyone is sticking to complete retail price, $449.95. Except for FuelMoto -- they have a significantly lower price, and they also have a Cyber Week deal that gives you another 6% off, which is another $23 off. Seems like a pretty screamin' deal. Now, their % off promotion isn't just for these slip-ons, I think it's site-wide and it varies depending on how much you spend; I just put 2+2 together and decided that they had the best deal on this muffler by far compared to every other site I've shopped.