Skip to content
🌟 Shop The Memorial Day Sale 🌟
🌟 Shop The Memorial Day Sale 🌟

GrimmSpeed Hella Horn Wiring Harness 2015-2021 WRX / 2015-2021 STI / 2013-2021 BRZ

SKU 040026
Save $3.90 Save $3.90
Original price $39.00
Original price $39.00 - Original price $39.00
Original price $39.00
Current price $35.10
$35.10 - $35.10
Current price $35.10

When it comes to wiring the Hella Horns mounted to your beautiful GrimmSpeed BroTie Bracket, we have you covered. Don’t stress yourself with trying to make a Hella horn harness from scratch when we offer a simple pre-assembled, OEM-quality harness that will allow you to plug and play in seconds. Our latest version of this harness has a custom-molded connector for an exact fit and is made longer to accommodate fitments for all 15+WRX/STI.

You’ll notice our harness does not incorporate the Hella-provided relay as standard. After some testing, we determined that the additional few dBs offered by wiring with a relay weren't worth the added headache and potential failure points of a more complex harness using the relay, inline fuse and additional wiring directly to your battery. Should your heart desire those last few ounces of dBs, our harness can be adapted for use with a more complex relay harness.


  • Automotive Grade 16ga Wire - Minimal resistance for maximum volume
  • Heat Shrink Terminals - Heat shrink, crimp-on terminals ensure a reliable connection
  • Protective Wire Sleeving - Clean black look, protects against abrasion and stress
  • Plug-n-Play with OEM Harness - Installs and uninstalls in seconds with our custom connector


  • 2015-21 Subaru WRX
  • 2015-21 Subaru STI
  • 2013-21 Subaru BRZ
  • 2013-16 Scion FRS
  • 2017-21 Toyota GT86

Customer Reviews

Based on 8 reviews
No wire work

Must buy if getting aftermarket horns. Plugs right into your harness so you don’t have to cut wires


Just as you said, the Grimmspeed Hella Horn Wiring Harness is a plug and play option and requires no wire cutting! Definitely the best option when wiring your new Hella Horns. Thank you for your 5 Star Review!


John L

Nice wiring harness. For anyone wondering it does NOT fit a 2016 NA Impreza 2.0i hatch, the OE horn plug is a different shape. That's on me though, I was able to make it work by breaking the plastic plug on the harness apart and using the pins inside to connect to the OE plug.


Thank you for your 5 Star Review of the GrimmSpeed Hella Horn Wiring Harness. You are correct, this will not fit the 16 Impreza. However, I am glad to hear you were able to make it work!


Lee Yang

Dope and love it


Thank you for your 5 Star Review and added pic of the GrimmSpeed Hella Horn Wiring Harness! It looks like you got the whole setup! The Hella Horns are a fantastic install for any Subaru! Not only are the horns super loud but they look amazing too!


Jesse Cox
Hella horn hardness

Quick and easy to install with my 2021 WRX standard model!


The GrimmSpeed Hell Horn Wiring Harness is a great way to make installing your Hella Horns that much easier! We appreciate your 5 Star Review!


Mark Leombruno
No bad review here.

Hard to give a bad review on this. Delivery was super fast as always with subimods. It's a wiring harness. One end fit perfectly into the factory plug and the other end fit perfectly onto the horns. Install was fast and stress free. 5 stars


We appreciate your 5 Star Review! The Grimmspeed Hella Horn Wiring Harness makes installing your hella horns that much easier!


Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare