Billetworkz Coolant Reservoir Cap – 2013–2021 FR-S / 86 / BRZ / 2015–2021 WRX / STI

Clean up your engine bay and ditch the faded plastic with the Billetworkz Coolant Reservoir Cap. Designed for Scion FR-S, Toyota 86, Subaru BRZ, and 2015–2021 WRX / STI platforms, this billet cap delivers a premium look with precise OEM-style fitment.

Key Features

• Precision Engineering: CNC-machined from high-quality 6061-T6 billet aluminum for strength, durability, and a perfect fit.
• Premium Finish: Available in multiple vibrant colors, finished in either anodized or powder coat (depending on color) for long-lasting corrosion resistance.
• Direct OEM Replacement: Installs in place of the factory coolant reservoir cap—no modifications or adapters required.
• Enhanced Aesthetics: Minimalist yet striking design that instantly elevates the look of your engine bay.

Why We Like It

This cap replaces one of the most visible plastic pieces under the hood with a high-quality billet component. It’s a quick way to make your bay look intentional and well-finished, especially when paired with other Billetworkz engine bay caps.

Specifications

• Material: 6061-T6 billet aluminum
• Finish: Anodized or powder coated (varies by color selection)
• Fitment Style: Direct replacement coolant reservoir cap

Installation Notes

• Install only when the engine is cool and system is not under pressure.
• Remove the OEM coolant reservoir cap.
• Install the Billetworkz cap in its place and ensure it seats fully and securely.
• Do not overtighten; hand-tight fitment is sufficient.

What’s in the Box

• (1) Billetworkz Coolant Reservoir Cap

About Billetworkz

Billetworkz has earned its reputation as a leading manufacturer of premium automotive accessories through more than a decade of innovation and quality craftsmanship. From foundational shift knobs to a full ecosystem of billet components, Billetworkz continues to deliver precision-engineered parts enthusiasts can trust.

Compatibility & Disclaimers

Designed for the listed FR-S, 86, BRZ, WRX, and STI applications. Finish color may vary slightly due to anodizing/powder-coat processes and display differences. Always follow OEM safety procedures when opening or servicing the cooling system.