Do i need a relay with these horns and if so will this one be ok?hella 4ra 003 530-001 relay, main current, 12v, with holder, with fuse

Hi. You do need a relay. It needs to be 12V and rated at minimum of 8 amps. Not sure if the one you mention is suitable but I'm sure you can find out in the net.

Will these fit a 97 Volvo s90 without changing the electrics

The are universal, so should fit anything.

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Signal Horn - STYLE HORN S90 SET - 12V - 111dB(A)

Product ID: 48632278

Details

Brand
HELLA
Colour
black
Item dimensions L x W x H
14.3 x 9.5 x
Material
Metal
Voltage
12 Volts

⚡12V electric power

🔄Dual-tone 350/415Hz frequency

🔊111dB piercing sound

€ 52.83

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Make your presence heard—loud, clear, and impossible to ignore!

DUAL TONE PRECISION - High and low tones at 350/415Hz create a rich, unmistakable alert.
RUGGED IP PROTECTION - IPX4K, IPX7, IPX9K ratings ensure durability against water and dust—built to last.
HERITAGE OF EXCELLENCE - 120+ years of innovation from HELLA, trusted by pros across cars, trucks, and bikes.
COMMAND ATTENTION INSTANTLY - 111dB loudness cuts through urban noise for undeniable presence.
UNIVERSAL FIT QUICK INSTALL - Fits most vehicles with a simple plug-in flat connector—ready in 15 minutes.

The HELLA Signal Horn S90 Set delivers a powerful 111dB dual-tone alert at 12V, engineered with robust IPX4K/7/9K protection and a universal fit for cars, buses, and motorcycles. Backed by over a century of HELLA’s horn expertise, this metal-bodied, easy-to-install set ensures your vehicle stands out with unmistakable sound quality and durability.

Specifications

ASIN	B00H8T8V8O
Automotive Fit Type	Universal Fit
Best Sellers Rank	77,898 in Automotive ( See Top 100 in Automotive ) 155 in Car Horns
Brand Name	HELLA
Colour	black
Compatible with Vehicle Type	Bus, Motorcycle
Customer Reviews	4.4 4.4 out of 5 stars (2,156)
Fit Type	Universal Fit
Global Trade Identification Number	04082300298369
Item Dimensions	14.3 x 9.5 x 12.5 centimetres
Item Weight	0.6 Kilograms
Manufacturer	Hella KGaA Hueck & Co
Manufacturer Part Number	922-000-971
Material Type	Metal
Model Number	3AM 922 000-971
Noise Level	111 Decibels
Number of Items	1
OEM Equivalent Part Number	111 951 113B-AUDI,111 951 113B-SEAT,111 951 113B-VW,191 951 113A-AUDI,191 951 113A-SEAT,191 951 113A-VW,191 951 113B-AUDI,191 951 113B-SEAT,191 951 113B-VW,191 951 113D-AUDI,191 951 113D-SEAT,191 951 113D-VW,1H0 951 113A-AUDI,1H0 951 113A-SEAT,1H0 951 113A-VW,6K0 951 091-VW,6N0 951 091-AUDI,6N0 951 091-SEAT,6N0 951 091-VW,6N0 951 113-AUDI,6N0 951 113-SEAT,6N0 951 113-VW
Style Name	Set
Unit Count	2.0 count
Voltage	12 Volts

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