With the addition of two more train horn kits, you can maximize your sound. This will really blow the neighbors out of the wood works. Some trucks are equipped from the factory with poor horns that sound wimpy. Lucky for you, train horn kits were invented that boost up your sound to train horn decibels. Be careful because with a kit installed, police officers will be on your tail trying to ticket you. Not to say these train horns are illegal, but they are meant for off-road use. That means keep it to the off streets and never in a crowded street. I am a professional installer of train horn kits. Every one of the train horn kits comes with the same parts, so if you know how to install them on trucks, you can do it over and over. First, begin with mounting the horn and compressor. These are easily placed in the bed of your truck. Then set up the tubing and seal with a water resistant coating. If you fail to do this, air can leak out and your horn will sound quieter than it should. After that, take your ride out for a drive and pound on the horn.