Can you connect this to the stock 10 AM horn circuit? Or do you have to operate it via higher ampere relay?

No, stock circuit 10 amp will not support it. So, i had it connected directly to the battery via a separate line with 30 amp relay.I purchased a the kit through the same vendor that offers it as an option.

Does this horn require a seperate compressor? Or is the compressor built into the unit?

Compressor is built into unit. For most applications it will fit in place of original horn.

Does this come with the relay?

I've installed a couple of these horns for a couple of people. Both relays, that came with the horn,failed at about the same amount of time. Replaced with Bosch relays and they have worked every since.

Save to say 2 horns =278db total output?

Are you asking if you put 2 horns together that the output would be doubled? That is not the way sound works. If you put 2 together, your output would be in the 143 dB to 145 dB range.Garret

Manufacturer	Stebel
Brand	Stebel
Product Dimensions	10 x 12 x 15 cm; 710 g
Item model number	NAUTILUS Compact Black 12V
Manufacturer part number	11690019
OEM Part Number	11690019
Special Features	Even with instructions and wiring kit, mounting this horn on a motorcycle may take some advanced skill
Item Weight	710 g

StebelNAUTILUS COMPACT BLACK 12V Air Horn

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