Most of the Harley Road Kings will fit, if as mentioned, no catalytic converter on board. This is a slight "chrome gap" where they slip on. If it bothers you, you can purchase
a pair of transition chrome clamps. Bought mine on eBay for 50-60 bucks. there's more info on here somewhere about clamps, bracket adapters, etc. I like the added
low end "grumble" without it being overpowering. I don't think any fuel mapping, etc. adjustment is necessary on these "Analog" bikes!!!! Good luck!!