The GrimmSpeed Hella Horn Wiring Harness makes it simple to add louder aftermarket Hella horns to a 2015 and newer Subaru WRX or STI without cutting into the factory wiring. GRMGRM040026 uses automotive grade 16 gauge wire to minimize resistance and deliver maximum volume to the new horns, while heat shrink crimp on terminals keep every connection reliable over time. A protective wire sleeving gives GRMGRM040026 a clean black look while guarding against abrasion and vibration related stress. Designed to plug directly into the OEM harness, this kit installs and uninstalls in seconds, making it an easy companion to a set of Hella horns and the GrimmSpeed BroTie mounting bracket.
| Year | Make | Model |
|---|---|---|
| 2015-2021 | Subaru | WRX |
| 2015-2021 | Subaru | WRX STI |
| Detail | Value |
|---|---|
| SKU | GRMGRM040026 |
| Manufacturer Part Number | 040026 |
| Wire Gauge | 16ga Automotive Grade |
| Terminal Type | Heat Shrink Crimp On |
| Fitment | 2015-2021 Subaru WRX and STI |
| UPC | Not published by manufacturer |
GrimmSpeed is a Minnesota based performance manufacturer known for practical, well engineered Subaru specific upgrades. GRMGRM040026 continues that approach by taking a common upgrade, aftermarket horns, and making the wiring simple and reliable.
The 040026 is the GrimmSpeed Hella Horn Wiring Harness designed for 2015 and newer Subaru WRX and STI models.
Which vehicles does GRMGRM040026 fit?It fits 2015 to 2021 Subaru WRX and 2015 to 2021 Subaru WRX STI models.
Does GRMGRM040026 include a relay?No, GrimmSpeed testing found the added volume from a relay was not worth the extra complexity, so the standard harness does not include one.
Can this harness be adapted to add a relay later?Yes, GRMGRM040026 can be adapted for use with a more complex relay based harness if desired.
Does this harness require cutting the factory wiring?No, it plugs directly into the OEM horn harness connector for a plug and play installation.
What gauge wire is used in GRMGRM040026?It uses automotive grade 16 gauge wire to minimize resistance and maximize volume.
Is a mounting bracket included with this harness?No, this listing is for the wiring harness only. A bracket such as the GrimmSpeed BroTie is sold separately.
How long does installation take?Most installers can connect the harness in a few minutes once the horns and bracket are in place.
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