If the exhaust pipes on your Harley Shovelhead keep coming loose, there are a few suggested solutions you can try, and one that will definitely work. Some of the solutions you can try would be to use a high-grade bolt and Loctite to keep them in place. In some applications, this will be enough to keep everything from loosening up. Another permanent solution is to drill your bolts and safety wire them so they cannot back out. This is the same method used on race bikes to keep debris off the race track. Colony Machine also makes a Shovelhead locking exhaust bolt kit. This is a sure fire way to keep your exhaust from coming loose, as it is a mechanical locking system that stops the mounting bolt from being able to back out and loosen up.