No 690chick, no modified anything. Wings says you don't need to remap anything but that you can use the Akro mapping if you want to. The instructions tell you to install using the stock header, then to start the bike (preferably from sitting cold over night) and let it idle for 15 minutes. The bike should self adjust. The only difference I have noticed on my bike after installing the wings pipe is she tends do die a couple of times after a cold start up (kinda like a carbureted bike when cold) but once warm she runs & starts just fine.