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

ASIN	B003ET0JJQ
Best Sellers Rank	387,217 in Automotive ( See Top 100 in Automotive ) 683 in Car Horns
Brand	Stebel
Brand Name	Stebel
Colour	Rot / RED
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.8 out of 5 stars 7 Reviews
Fit Type	Universal Fit
Fit type	Universal Fit
Item Dimensions	10 x 12 x 15 centimetres
Item Weight	710 Grams
Item dimensions L x W x H	10 x 12 x 15 centimetres
Manufacturer	Stebel
Manufacturer Part Number	11690019
Material	Plastic
Material Type	Plastic
Noise Level	139 Decibels
Style Name	Compact
UPC	607634467836 700313950176
Voltage	12 Volts (DC)

NAUTILUS COMPACT BLACK 12V Air Horn

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