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Thread Like Summary
Whizjet
Total Likes: 11
Original Post (Thread Starter)
#845608 06/26/2026 2:48 PM
by Whizjet
Whizjet
So, having nearly been eliminated by another blind lane-changer in a Range Rover who didn't bother looking, I am wanting to invest in a much louder horn.
When I was running motorcycles, I always upgraded to horn as a matter of good practice - saved my bacon more than once.
Would anyone have any advice as to the loudest and most aggressive car horn available on the market at present?
(NB - I don't want air horns that play La Cucaracha, just something that sounds like an 18 wheeler!)

Thanks in advance.
Liked Replies
#845646 Jun 27th a 09:03 AM
by Burgundymog
Burgundymog
Originally Posted by Whizjet
Thanks Keith - is that an air horn?
If so, is there a slight delay when activating as the compressor spins up?
And do you have a model number?


Apologies Ben they are not Fiamm but .....

Piaa sport horns 400 hz and 500 hz not air horns so no delay.
1 member likes this
#845641 Jun 27th a 07:13 AM
by RichardV6
RichardV6
Originally Posted by Mick Annick
Stebel Nautilus horns, built-in compressor and very loud, only problem here is I get mistaken for the boulanger’s van…

+1 for the compact twin Steibel air horns available here. You will need a diode protected relay not the cheapo one supplied and also need to uprate horn fuse to 20 amp.

Following on from Jon's post above no worries about ECU, it's an entirely independent circuit. I used original wiring to provide main feed to relay without issue, just remember to uprate fuse.
1 member likes this
#845609 Jun 26th a 02:59 PM
by Burgundymog
Burgundymog
I fitted twin Fiamm horns, they fit nicely behind the grill and are really loud.
1 member likes this
#845611 Jun 26th a 03:46 PM
by Image
Image
Had a couple of late-night near misses towing home from race meetings with (mostly foreign) artics drifting across lanes .... presumably they'd been driving through a few countries to position their tired carcasses in the path of my camper!

I got a pair of Russian truck-horns with associated compressor ... cheap as chips off ebay ... they sound like the last trumpeting of Angels at Armageddon (more like a US freight train than a road vehicle) .... ran them off the existing horn push through a relay .. because the compressor takes half a second to spool up you can give a quick polite toot of the old horn (sometimes useful) but if you hold the button a smidge longer it's WW3 🙂

Sure to wake even the most dozy midnight trucker.

Only issue may be finding a suitable unused space under the bonnet.

K
1 member likes this
#845619 Jun 26th a 05:03 PM
by Image
Image
Never been mentioned at MOT time ... and they've been on several years.

If you're worried you can pull the relay and they'll only hear the polite horn. Wouldn't want to unleash the big-guns in the confines of a garage!! 🙂

K
1 member likes this
#845631 Jun 26th a 07:42 PM
by CooperMan
CooperMan
Be careful of imposing any additional amperage load on the circuit of the 3.7 Roadsters as I think it's wired via the complex (sometimes flaky) BCU

Richard V6 fitted some aftermarket horn to his & hopefully will be along to advise thumbs
1 member likes this
#846063 Jul 7th a 04:38 PM
by Burgundymog
Burgundymog
Originally Posted by sewin
Yes as Richard says its an independent circuit and always use diode protected relays in all positions!
There technically is an MOT issue with most Morgans as most fall outside the cut off date allowing air horns to be installed. First thing to check is have you just got one horn fitted behind the grill/stone guard. If so it is probably the low tone klaxon. The car is wired for two and the wires are just taped up, the mounting hole is also there. Just buy the high tone option or a kit with both in and fit the high tone as well. You will be very pleasantly surprised by the difference in both sound and volume and nothing else will need to be modified to fit this addition.

That's what I did, original was useless.
1 member likes this
#846061 Jul 7th a 04:16 PM
by sewin
sewin
Yes as Richard says its an independent circuit and always use diode protected relays in all positions!
There technically is an MOT issue with most Morgans as most fall outside the cut off date allowing air horns to be installed. First thing to check is have you just got one horn fitted behind the grill/stone guard. If so it is probably the low tone klaxon. The car is wired for two and the wires are just taped up, the mounting hole is also there. Just buy the high tone option or a kit with both in and fit the high tone as well. You will be very pleasantly surprised by the difference in both sound and volume and nothing else will need to be modified to fit this addition.
1 member likes this
#845692 Jun 28th a 08:59 AM
by Burgundymog
Burgundymog
Originally Posted by Alan Patterson
Originally Posted by Burgundymog
Originally Posted by Whizjet
Thanks Keith - is that an air horn?
If so, is there a slight delay when activating as the compressor spins up?
And do you have a model number?


Apologies Ben they are not Fiamm but .....

Piaa sport horns 400 hz and 500 hz not air horns so no delay.

Hi Keith
They sound like (pun intended) just the ticket for negotiating the double mini roundabouts at the end of our road where drivers regularly just drive across the second one and ignore anyone trying to turn right into our road.
Did you need to fit a relay?

Alan no, didn't fit a relay they draw a combined 5.5 amps. They certainly wake up those idiots who think oh there's an old car coming I'll just wander out in front of it.
1 member likes this
#845666 Jun 27th a 04:25 PM
by RichardV6
RichardV6
There all the same generic type. Call them Steibel, Nautilus or whatever. Wouldn't be surprised if they are all made at the same Chinese factory as unbadged items then boxed and labelled for different world markets.
1 member likes this
#845659 Jun 27th a 12:34 PM
by TBM
TBM
I use these - got one on the MG, the Morgan and the Harley.

Plenty loud enough. https://www.halfords.com/motoring/car-accessories/exterior-styling/12v-compact-air-horn-678022.html
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