Dumb question, but for this 10mm bolt, is the nut 10mm, is the bolt 10mm long, or the diameter of the thread on the bolt 10mm? Seems like if we used a regular yellow (for 10-12 gauge wire) ring, wouldn't the 10mm bolt/nut combo be too big?

I'm preparing to do the hella install today on my FRS.

Okay going to go in...Attachment 28935

i went to a Home Depot and picked up a Bolt, washer and nut. I brought one of the wires with me and got a bolt that fit.

Yeah just came back from Lowe's and picked these up. M5-.80 x 16's with wave washers and hex nuts. Going to try to use these for grounding of both the high and low. They're 8mm hex not 10mm. Hopefully they'll work just as well. Forgoing the Hella-provided relay too for my install. Attachment 28940

Sorry for the confusion. 10mm refers to the size of the head, thus the wrench or socket used to remove this bolt would be a 10mm wrench. In reality it would be a m6x1.0mm bolt. m6 meaning metric 6mm. 1.0mm would be the thread pitch. in this case length is not specified.

I ended up drilling two holes in the bumper to get my two grounds since my rings weren't the correct size. I always seem to have difficulty finding rings to tap into existing stock bolts even when I was more active doing car stereo stuff.

Why are you guys drilling places or installing ground studs to get a ground ?
The connector on the right side has a ground .. Use that. You just need a spade lug and splice that to have to grounds ..

It is now done. The grounds via my new holes are now done, clean, and strong. I like to ground as close and secure to the chassis as I can without extra wire adding additional resistance to ground. I also didn't just use a blade connector onto the stock low-freq power cause there appears to be some electrical grease in there that made that connection weak so I just cut that too and ensured I had a good strong crimp to that signal. The Hellas are indeed hella loud.

The only two things about my install is that using the mounting locations suggested by the OP, the horns appear slightly off-centered. Maybe it is just something I notice, but probably off by a few millimeters. In the entire bumper removal process I damaged one plastic fastener and got another one unaccounted for at the end. Also wasn't sure if my mud-flaps under the bumper were placed back exactly 100% like it was stock.

Here are some photos from my install. As you can see it is slightly off-centered. I may go back in one day to move/adjust them, maybe back to the stock mounting locations. My preference would to not to have the front license and the horns blocking the radiator, but it shouldn't impact things too much.

Mine are off center also. I plan on finding a new way to mount them when I pull the bumper off to install a CAI.

Off-topic, but which CAI intake are you planning on getting? AEM? That might be the next time I remove the bumper too (to install a CAI)... the slight off-centered-ness (if that's a word) of the Hellas is bothering me a bit and makes the very slightly off-centered-ness of my license mount more pronounced.

Or I might get in there to install some fog-lights once more options are available... I guess this entire exercise was also good to get used to how to remove the front bumper.

Just followed these instructions over the weekend, for the most part. Figured I'd share my experience to make it easier for others...

Removing & replacing the bumper sucked. Corner markers do not come off easy, and must literally be pried off until they pop. The sides of the bumper in front of the corner markers essentially come off in the same manner -- just pull firmly until 3 or 4 tabs pop loose. I was caught off guard by the variety of different bolts and push tabs holding the bumper on -- make sure you keep those organized as they come off.

There's also a push tab in each hole left by a corner marker (facing upwards). It took me forever to find those.

I also wired the whole thing twice -- once as described in this post before tearing all that out and replacing it. I ended up splitting the existing wiring (ground=black, positive=black+green) and running it to both horns in parallel, including ground. This also keeps the horns on the existing fuse(s). Side note -- you don't need any new bolts to wire it this way, as you don't have to create a ground.

I can also confirm that the existing horns run at 12v, so use of the relay is not necessary.

Best DIY front bumper removal step-by-step
 

This is by far the best DIY step-by-step for removing the front bumper.

http://www.grillcraft.com/installs/i...install_id=309

It made removing the side-markers a lot easier. Also helps if the car is lifted a bit so you can see which fasteners are of what type.

sound clip on frs plz

i havent decided. i might go perrin or i might go FA20club.

Installed a pair of Supertones on my BRZ yesterday. It's possible to do it without cutting the stock wiring by trimming down a standard blade connector so it fits in the stock power connector. Also, my BRZ didn't have a second threaded bolt hole on the left side for the second ground connector, so I had to use a nut and lock washer instead.

Just about to install mine. I painted my housing white to match the body. I'll post pics when I'm done.

Sent from my Galaxy Nexus using Tapatalk 2

Why install these horns? Are they louder?

Much louder

Via my Note 2

I managed to install these horns without pulling off the front bumper, but I have a lift in my garage. You can unbolt the plastic piece from the bottom and have enough room to work if the car is off the ground. I also disassembled the horns and painted the red parts black so they wouldn't show through the grill.

https://sphotos-a.xx.fbcdn.net/hphot...77776256_n.jpgdrilled right into the support they line up perfect with the grill and not uncenterd
https://sphotos-b.xx.fbcdn.net/hphot...58322057_n.jpg

Ill get you guys a sound clip in outdoors and in a home garage soon. I need to redo the spade connection, that grease is annoying and the spade slips out. Going to solder that b*tch together.

Totally forgot to update my post with a pic... Here ya go http://img.tapatalk.com/d/13/05/28/zemyhu6y.jpg

Sent from my Galaxy Nexus using Tapatalk 4 Beta

I used this DIY to install my horns. No need to take the bumper off though. Just get it up on stands and access from under the front of the car. I used this horn instead:

[ame="http://www.amazon.com/PIAA-85115-Superior-Bass-Horn/dp/B0060ZB43G/ref=sr_1_3?ie=UTF8&qid=1370224201&sr=8-3&keywords=PIAA+horn"]Amazon.com: PIAA 85115 Superior Bass Horn: Automotive[/ame]

Thought I'd post this here so people could hear the difference a new horn makes on this car.


[ame]http://youtu.be/o86kRYWHOzQ[/ame]


Thanks again for the DIY!

I must be missing something here because my friend and I found a really easy way to do this. Note: This only works for people that don't care about "showing off" the horns.

For the low horn, plug the factory connector into the supertone and add a ground wire with a spade connector and ground to the factory mounting point. Done.

For the high horn, cut off the factory connector and add spade connectors to the ends of the power and ground. Loosen the factory horn bracket and flip it so the horn goes the other way (closer to drivers side). That's it.

One of the horns is still on display which I'm OK with but I painted the "grills" black for stealth factor anyways. In the end, the horns are in the stock location.

Only thing is...I could be wrong but I think the horn will no longer beep when pressing the lock button on the remote 3 times. Doesn't bother me :iono:

I created an account to say thank you. This was a much easier install.

Question: I mounted in the same location as most of the Hellas here, and I just noticed today after having them for a long time that they're not symmetrical vertically. As in, one is higher and one is lower. It's like my lower grille has a lazy eye.

Is that how anyone else's is? Is one bolt lower than the other?

My low pitch horn went out, it sounds like a bicycle horn now :lol:

I'm having the same issue but I didn't try to fix it

https://fbcdn-photos-b-a.akamaihd.ne...86702400_n.jpg

Here is mine. I left my stock horns in place, and tapped into the wire at the horn to trigger a relay to turn these horns on.
And I made my own brackets to get them where I wanted.

They look good and neatly installed. I will try to align mines properly

Great write up! We have these units in stock if anyone is interested. I can't post a link or pricing, but they can be found in the accessories section of the site.

How you mounted them? on the front bumper or where exactly?

Here are a few install pics.

https://scontent-b-sea.xx.fbcdn.net/...89690839_n.jpg

https://scontent-a-sea.xx.fbcdn.net/...00123313_n.jpg

https://scontent-a-sea.xx.fbcdn.net/...06795236_n.jpg

Ive done this install on my BRZ, but didnt do the whole bumper off thing, u just took the lower bumper guards off its double layered. It has a softer plastic lower shield helt on with mainly pop out the centre clips and thwo 10mm bolts, then there is a thicker more rigid panel in there held on with half a dozen 10mm bolts, and secured to the arch liners behind the bumper with two inverted pop out the centre clips, gets you all the access you need in about 5 minutes.
Any how i'ma bit under whelmed at the output of these horns, i'm not really concerned they are still loud enough to be road legal in the uk, but they arent any louder then my friends gt86 stock horns, its wired exactly the same as the guide suggests, well they share a grounding point but that shouldnt matter. They are both sounding you can hear the who different tones, but it just sounds like a deranged road runner.

http://www.subimods.com/french/subim...rness-kit.html

For the Lazy

I put mine side by side to the left. Right by my oil cooler. Honestly you can't see them much on the FRS anyway so I made them stealth lol.
http://i999.photobucket.com/albums/a...ps5c421f23.jpg

Anyone else not seeing the pictures in the Original Post?

Here's a before and after video comparing the two horns.

I mounted them in the stock location.

[ame="http://www.youtube.com/watch?v=-T5M8YsF85Q"]Hella Supertone Comparison - YouTube[/ame]

The first time I used my horns on my 2014 FR-S, I laughed out loud. It let out a timid "meep meep". I needed something that would grab people's attention and yell, "HEY, I'M DRIVING HERE!!" I have some experience putting Fiamm horns on motorcycles. It grabs people's attention when they hear what sounds like two tons of '70s Buick bearing down on them. That's what this car needs.

I didn't like the location of the original low-tone horn, hidden behind the right turn signal, so I mounted them both on the hangar behind the grill that held the original high-tone. Now the full force of the sound can come straight out to the traffic around me.



I used the original wiring, but added a little extra length to the power lead mainly to ease mounting. I used the chassis for the ground. I did all the work from beneath by removing the two aerodynamic panels on the bottom of the car. Total time for the mod was about an hour and a half.