Train Horns and Train Horn Kits are the loudest air horns you can buy; at least that we've ever encountered. Some people think it's a rather odd feature to have excessively loud train horns mounted on your car or truck. However, like anything else in the custom auto accessories world, the name of the game is to do something different or unique. Train horns are definitely that. And loud. Your standard car or truck horn is only used when needed and possibly to quickly say 'hello' to someone in passing. Our truck horns are a little different than that. It can Be Installed on Most Cars,Trucks, Suvs, and Boats Be LOUD! Be PROUD!