you want the best setup that will look show quality and be loud and you will never have an issue...
Buy a Viair tank and compressor combo.... you can pick them upi anywhere, thats what I did.... I have a quick release on the truck to add a air hose for tools and an air chuck too.... I run one line to that.... I have one line to my switch and gauge in the cab for my airbags.... and finally I have one to the horns...which I got at Street Beat Customs.... you can find them on the web and they have a great selection... and they aren't plastic garbage, they are chrome plated and they are metal....and they are loud as all hell