Koyo Aluminum Filler Neck

Part #: FN3037

Overview

The Koyo Aluminum Filler Neck is a high-quality replacement component designed for the 2022 Subaru BRZ and Toyota GR86. Crafted from billet aluminum, this filler neck offers a durable and corrosion-resistant alternative to the factory plastic unit. Its sleek, all-metal construction not only enhances the aesthetic appeal of your engine bay but also provides superior resistance to steam erosion and cracking, common issues with OEM plastic filler necks. This product is ideal for enthusiasts seeking a reliable upgrade that combines durability with a clean, performance-oriented look. The integrated 1/8 PT sensor port allows for easy installation of temperature sensors, making it compatible with most Japanese gauge systems and supporting precise temperature monitoring for optimal engine management. Whether you're restoring a stock vehicle or building a custom performance setup, this filler neck helps ensure long-lasting performance and a refined appearance.

Key Features

This billet aluminum filler neck is engineered with both form and function in mind. Its key features include:

• Constructed from high-grade billet aluminum for strength and corrosion resistance
• Integrated 1/8 PT sensor port for temperature gauge compatibility
• Eliminates common plastic filler neck issues such as steam erosion and cracking
• Designed for direct replacement of the factory filler neck on compatible models
• Enhances the engine bay aesthetics with a sleek, machined finish
• Lightweight yet durable construction to support long-term reliability

Construction & Design

The filler neck is machined from billet aluminum, ensuring a precise fit and a high-quality finish. Its robust design is intended to withstand the heat and pressure conditions within the engine bay, providing a significant upgrade over OEM plastic components.

Installation & Fitment

Installation involves replacing the factory filler neck with this billet aluminum unit, typically requiring basic hand tools. Fitment should be verified against vehicle specifications and part compatibility details to ensure proper installation.

What’s Included

The package includes the aluminum filler neck with integrated sensor port, ready for installation. Additional hardware or accessories are not included and should be sourced separately if needed.

Ideal For

This product is perfect for Subaru BRZ and Toyota GR86 owners looking to upgrade their cooling system components with a durable, performance-oriented part that enhances both function and appearance. It is especially suitable for those building custom or high-performance engines who require reliable temperature sensing and long-term durability.