Air Horns Help

[Cassinova 10+ year member]

Well I had an air horn laying around and I threw it into my Altima. Its sitting by the lower grill but it doesn't sound loud enough. I have the wires ran into the car connected to 12v (150amp wire behind the fuse box) and grounded (cut in two with a button). Hearing other horns makes my horn go to shame. I did not run the relay do you think that could be a possibility? I am going to re-position the horns behind the grill and was thinking of adding another compressor. 2 compressors to 2 horns. How ever I need help on figuring out how to wire the 2 compressors with the relays (if needed) to the button. And if it is more advisable to run 2 horns to each compressor instead of the 2 horns to the 2 relays. Thanks.

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