The GrimmSpeed 2015+ WRX/STI Hella Horn Wiring Harness is designed for the 2015-2021 Subaru WRX and the other applications in the fitment table. Match manufacturer part number GRM040026, the complete vehicle or system configuration, dimensions, connections, and included components before ordering.

Key Features

• Exact configuration is identified by the manufacturer part number
• Dimensions, material, finish, quantity, and interface vary by listing
• Vehicle or system compatibility must be confirmed before ordering
• Included components are limited to what the exact listing states

Fitment

Specifications

What’s Included

One new GrimmSpeed horn accessories identified by manufacturer part number GRM040026, in the quantity stated by the title. Additional wiring, pipes, hoses, clamps, fittings, gaskets, fluids, tuning, tools, and installation hardware are included only when expressly listed for this exact part number.

About GrimmSpeed

GrimmSpeed develops exhaust, forced-induction, cooling, engine, electronics, and exterior components for import and performance vehicle applications.

Related GrimmSpeed Products

• Shop all GrimmSpeed products
• GrimmSpeed 02+ WRX/STi BroTie Hella Horn Mounting Bracket
• GrimmSpeed 02-21 Subaru WRX / 04-21 Subaru STI BroTie Hella Horn Mounting Bracket
• GrimmSpeed 2015+ WRX/STI Hella Horn Wiring Harness

Frequently Asked Questions

How do I confirm this GrimmSpeed part is correct?
Match the exact manufacturer part number, dimensions, material, finish, quantity, electrical requirements, and connection or mounting interface before ordering.

Is this a complete kit?
Only the components stated in the title and Whats Included section are supplied. Related wiring, fittings, hoses, clamps, sensors, tools, or hardware may be sold separately.

Can this part be used in a custom application?
Universal parts may work when every dimension and interface is verified. Vehicle-specific or system-specific parts should not be treated as universal without current manufacturer confirmation.

Installation Instructions

Follow the current GrimmSpeed instructions and the vehicle service manual for part number GRM040026. Compare every component, connection, dimension, and mounting point before disassembly. Use the correct tools, fasteners, torque values, fluids, wiring protection, and safety procedures, then inspect for leaks, interference, heat exposure, clearance, and secure operation before normal use.