What are the major difference between the HELLA 007424801 and the 007424804?

I think the only difference would be the frequency of the horns. Other than that, I don't know of any other difference. Just my opinion.

Is one horn louder than the other?

You can check out the specifications on www.myhellalights.com and you down load a hella app that has sound from the app store. This has 116 db and the other is 228. This horn sounds like a trumpet and the supertone has a higher pitch.

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🚗🔊 Make your Audi heard — because safety never goes out of style!

BUILT TO ENDURE - Crafted with German precision and durable materials to withstand daily driving challenges.
DUAL TONE ACOUSTIC POWER - High-tone 500 Hz and low-tone 400 Hz horns combine for a rich, unmistakable alert.
PLUG PLAY INSTALLATION - Comes with M8 screw bracket and specific connectors—no assembly hassle, just upgrade.
COMMAND ATTENTION INSTANTLY - Ultra-penetrating 105-118 dB sound cuts through traffic noise for unmatched safety.
TAILORED FOR AUDI EXCELLENCE - Specifically engineered with a perfect OEM fit and connector for Audi models (2001-2013).

The Hella 12V BX Trumpet Horn Kit is a premium dual-tone horn set designed exclusively for Audi vehicles (2001-2013). Delivering a powerful 105-118 dB sound at 12 volts and 6 amps, it ensures maximum road safety with a distinctive acoustic signature. Engineered with precision German craftsmanship, this black horn kit offers a perfect OEM fit, durable construction, and easy installation, making it the ultimate upgrade for performance-driven Audi owners.

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Great experience from order to delivery. Highly recommended!

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Brand	Hella
Colour	Black
Item dimensions L x W x H	10.8 x 10.8 x 8.3 Centimeters
Style	Classic
OEM Part Number	4F0951221A, 4L0951223A, 8H0951221, 8H0951223, AUDI
Manufacturer	Hella
Global Trade Identification Number	04082300397109
Product Dimensions	10.8 x 10.8 x 8.26 cm; 453.59 g
Item model number	011225841
Manufacturer Part Number	011225841
Position	Front Inside
Assembly Required	No
Country of Origin	USA
Item Weight	454 g

Hella 12V BX Trumpet Horn Kit for Audi (Set of 2, Black)

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