Subaru STI Horn Wiring Harness - GrimmSpeed - Hella - 15-27. Purpose-built for 2015–2027 Subaru WRX/STI, this harness makes powering your Hella horns straightforward and dependable.

Designed for enthusiasts adding Hella horns to late-model Subarus, the GrimmSpeed harness offers a clean, vehicle-focused solution. It delivers solid power and integrates with the factory horn circuit to help you avoid cutting into OE wires. Lengths are planned for the front bumper area, and durable materials and terminations support consistent operation in daily use and spirited weekends.

Features

• Direct fit for 2015–2027 Subaru WRX/STI
• Built for Hella horn upgrades
• Plug-and-play installation, no cutting required
• Clean routing and reliable power delivery
• Durable, engine-bay-ready construction

Have questions or want help planning your setup? Call us—we’re happy to help. We offer installation and customization at our Austin, Texas and Los Angeles, California area locations. TX: 512-982-9393 (TX) | CA: 562-981-6800 (CA)

If you’re considering multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov