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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-05-2009, 12:29 PM   #1
cohibafan
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Join Date: May 2007
Location: San Diego
Posts: 40
My Ride: 04 330CIC
Dual-Stebel Horn Upgrade E46

Got tired of the women in SUV's plowing into my lane without noticing my horn.
This doesn't include pictures (sorry, I know… this thread is worthless without pics, blah blah blah), but I'll cover some of the various gotchas and pitfalls.

This is for a 2004 330CIC, but I’ll assume most E46s will be similar if not identical. If not, my apologies.

Bought two Stebel Nautilus horns from ecrater.com (very nice people and quick shipping).

Didn't need to remove bumper (removed headlights instead).
Bottom two bolts for headlights were tough, but you get used to it.

Mounted the Stebel's using the included nut and bolt - it fit just to the outside of the existing horn underneath the last pre-drilled slot on the bumper. When I say ‘bumper’ I’m referring to the internal silver colored bumper, not the bumper cover. I’m not sure if its steel or aluminum, but you get the picture.
It's a very tight fit. You may see your ‘bumper cover’ project a bit when you tighten the bolt (especially on the passenger side). I corrected this by using a heavy gauge screwdriver to bend the bumper slightly upward – it only needs a little bit.

Tired at first to skip the relays and use the existing wiring (just the 2 Stebel's and not the stock horns) - blew the 15 amp fuse immediately.

Mounted the two relays (included with horn) to the top of the bumper (between the stock and new horn).

Installed a 3-fuse block by the battery terminal under the hood ($9 at Pep Boys). Ran 2 14 gauge power lines from fuse block – one to each relay.

Ran one power line from each relay to each horn. Ran one ground line from each horn to the ground screw just over each wheel well (look for a cluster of brown wires).

Lastly, I used wire taps to tap into the existing two horn leads. I ran a wire from each to the remaining two terminals of the relay.

Now, when it press the steering wheel horn, the stock horns sound off and trigger the relays thus activating the Stebel horns.

I haven’t scared anyone off the road yet, but I haven’t yet had the chance

I hope this helps others in the same position as I. Feel free to hit me up with any questions. I'll do my best to help.
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Old 05-05-2012, 05:20 AM   #2
car_man16
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Join Date: Jan 2012
Location: Vancouver Canada
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My Ride: 2002 BMW 325I
All that writing and no one posted anything well heres a post found this thread on google
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Old 05-05-2012, 05:56 PM   #3
shanekhalifa99
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Join Date: Apr 2012
Location: Baltimore
Posts: 150
My Ride: e46
Why would you reply on a thread from 3 years ago
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Old 05-05-2012, 07:00 PM   #4
LoveBeingUseless
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My Ride: 2003 325i Sedan
lol.....
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Old 05-05-2012, 07:11 PM   #5
trippmann
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i bet mines louder...
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