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Replace That Weak Factory Horn with a Dual-Tone Hella Setup
The factory horn on the WRX and STI is famously underwhelming, and the GrimmSpeed BroTie Hella Horn Kit fixes that with a proper dual-tone Hella horn setup mounted on a purpose-built GrimmSpeed BroTie bracket. It's a direct-fit kit that uses the factory plug-and-play OEM connector, so there's no need to cut or splice wiring. The result is a noticeably louder, more assertive horn sound without any custom fabrication.
Key Features
- Dual-tone Hella horn set for a louder, more assertive horn sound
- GrimmSpeed BroTie mounting bracket designed for a clean, direct fit
- Plug-and-play OEM connector requires no wire splicing
- Simple bolt-in installation using factory mounting points
- Direct fit for WRX and STI models listed in the fitment table
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2002-2021 | Subaru | WRX |
| 2004-2021 | Subaru | STI |
Specifications
| Detail | Value |
|---|---|
| Brand | GrimmSpeed |
| Part Number | GRM040004 |
| Type | Horn Upgrade Kit |
| Horn Brand | Hella |
| Tone | Dual-tone |
| Connector | OEM plug-and-play |
What's Included
- GrimmSpeed BroTie mounting bracket
- Hella dual-tone horn set
- Mounting hardware
About GrimmSpeed
GrimmSpeed designs and manufactures performance and upgrade parts specifically engineered around Subaru platforms, pairing trusted third-party components like Hella horns with its own mounting hardware.
FAQ
What is the GrimmSpeed BroTie Hella Horn Kit?
It's a horn upgrade kit pairing a Hella dual-tone horn set with a GrimmSpeed BroTie mounting bracket, designed as a direct plug-and-play replacement for the weak factory horn on WRX and STI models.
Which vehicles fit the GRM040004?
This kit fits 2002-2021 Subaru WRX and 2004-2021 Subaru STI.
Do I need to cut or splice any wiring?
No, the kit uses the factory OEM connector for a plug-and-play electrical connection.
Is the BroTie bracket included?
Yes, the GrimmSpeed BroTie mounting bracket is included along with the Hella horn set and mounting hardware.
Will this horn be significantly louder than stock?
Yes, the Hella dual-tone horn set is noticeably louder and more assertive than the factory horn.
Does this kit fit both WRX and STI equally?
Yes, the kit and bracket are designed to fit both WRX and STI models across the listed year range.
Do I need any special tools to install this kit?
Basic hand tools are typically sufficient since the kit uses factory mounting points and connectors.
Will this affect my factory horn button or steering wheel controls?
No, the horn button and steering wheel controls remain unchanged since the kit uses the OEM electrical connection.
Install Instructions
- Disconnect the negative battery terminal before beginning work
- Locate the factory horn behind the front bumper
- Unplug the factory OEM connector and remove the factory horn
- Install the GrimmSpeed BroTie mounting bracket in the factory location
- Mount the Hella dual-tone horn set to the BroTie bracket
- Connect the OEM plug-and-play connector to the new horn set
- Reconnect the battery and test horn operation before reassembling the bumper area
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