I've got an air horn on my Box and always ran them on my motorcycles. Yes, I definitely think it's a good thing to have. Mine are actually two horns attached by tubing to a small compressor. I definitely need to use a relay for the power that these draw. There are two electric/stock horns under the front bumper. I pulled the wiring from one of them and used it to trigger the relay. The power to the horns from the relay is fused and goes directly to the battery. I left the other stock horn in place and I recommend you do this too. Air horns take a few milliseconds to respond. It's nice to have the immediate response of an electric horn still in place for when you just want to tap the horn (beep beep) or when you need a real quick response (emergency situation).
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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