• Pre-assembled, application-specific harness
• Compatible with Hella horn installations
• Uses factory-style connectors where possible
• Simplifies wiring versus a DIY setup

Wiring Done Right for Aftermarket Horns

Swapping in aftermarket Hella horns often means dealing with a factory wiring harness that isn't quite designed for the higher current draw of a proper horn setup, leading to a lot of owners improvising with generic relays and butt connectors. GrimmSpeed's Hella Horn Wiring Harness solves that with a pre-assembled, purpose-built harness engineered specifically for this platform. Rather than piecing together a wiring solution from parts-store components, everything needed for a clean install is included. It's a detail that pays off the longer you own the car.

A Cleaner, More Reliable Install

Using a properly sized relay and factory-style connectors where possible, this harness handles the horn's current draw reliably without relying on the factory circuit that wasn't designed for it. That reliability matters, since a poorly wired horn setup is a common source of intermittent electrical gremlins down the road. It takes the guesswork out of wiring aftermarket horns and gives you a setup that just works. That kind of thoughtful engineering is what separates a properly developed part from a copy of one.

Straight From Subispeed

Takes the guesswork out of wiring aftermarket horns on a WRX or STI — a clean, tested solution rather than a DIY wiring project.

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