I installed the single Stebel Magnum, its ok but I am going to make it a dual setup. It just doesn`t have the sound I was looking for. I would get two horns.
2 stainless brackets, I made myself and some wiring... you need a fused relay to run the compressor off the horn line and that was about it... I'm getting ready to do it in the new subie to... lol... completely different install though, because things underhood are different..
WOO WOO! just got my new dual tone fiamm's in. Bolted them both to the bracket the hood latch is on since its already got a nut and i happened to have a bolt that matched perfectly. got some quick connects from autozone and wired them both in line with the stock horn. definitely catches attention the way i want now instead of provokig laughter. pix will be up soon in my garage