GrimmSpeed Wiring Harness for Hella Horns - 2015-2021 Subaru WRX / STI

GrimmSpeed Wiring Harness for Hella Horns, 2015-2021 Subaru WRX / STI

The GrimmSpeed Wiring Harness for Hella Horns on the 2015-2021 Subaru WRX / STI is a plug-and-play wiring solution for Hella Supertone or compatible horn installation. Connects to the factory horn wiring without cutting or splicing, plug in the factory connector, connect the horns, done.

DETAILS

• Plug-and-play, no cutting or splicing
• Relay included for correct horn current delivery
• Compatible with Hella Supertone and similar
• Fitment: 2015-2021 Subaru WRX / STI

The factory Subaru horn wiring is insufficient current for Hella units to operate at full volume. The GrimmSpeed harness includes a relay that draws current from a fused source and delivers it correctly to the horns, no loading of the factory horn circuit.

The plug-and-play design requires no wiring knowledge. Factory horn connector goes into the harness, relay draws from a fuse location, horns connect to harness outputs. Complete in under an hour.

What's in the Box

• GrimmSpeed wiring harness
• Installation instructions

Why Choose GrimmSpeed

GrimmSpeed has been engineering performance parts for Subaru platforms from their Portland, Oregon facility since 2003. Everything they make is designed around real-world use, their engineers drive the same cars their customers drive, which means product decisions are made with genuine platform knowledge behind them. GrimmSpeed designs parts in-house, sources quality materials, and validates fitment on the actual application before release. The result is parts that install correctly the first time, perform as advertised, and hold up under the conditions Subaru owners actually subject their cars to. Whether it is a critical engine component or a cosmetic upgrade, the same attention to detail and fit quality applies across the catalog.

The RallySport Take

The GrimmSpeed harness is the correct wiring solution for Hella Supertone installation on the 2015-2021 Subaru WRX / STI. Pair with the Brotie bracket for a complete installation. Fits the 2015-2021 Subaru WRX / STI.

Fitment