Just dickin around in the garage again, these are some Hadley air horns off a semi truck. Getting them ready for the 4th truck I've had them on. As I mention in the video they saved my life once and my ass several times. This is a low budget halfass method of installing air horns, remember that if you want some air horns without buying them: there are DIY air horn videos on YT and they're extremely simple to make out of PVC, a little bicycle tube rubber and some hardware.