A small detail that makes a big impact. The GrimmSpeed Titanium Radiator Cap takes everything that made our standard 1.3 bar cap a trusted cooling upgrade and gives it a whole new look, feel, and finish worthy of the most refined Subaru builds.
Finished in a unique burnt ombre hue, this cap adds strength, style, and corrosion resistance to your cooling system. The unique heat-treated color shifts from blue to bronze depending on the light, turning a simple functional part into a standout piece of hardware.
Underneath the new finish, the engineering remains the same; a 1.3 bar (18.9 psi) pressure rating designed to raise the boiling point of your coolant, maintain system pressure, and keep fluid sealed even during extreme heat cycles. Whether you’re running an antifreeze mix or distilled water for track use, consistent pressure means better thermal stability and fewer chances for overflow.
The GrimmSpeed Titanium Radiator Cap is more than just a beautiful accent for your engine bay; it’s a precision part built to perform.
Quick Specs
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Pressure Rating: 1.3 bar / 18.9 psi
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Finish: Burnt ombre titanium (blue-to-bronze gradient)
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Seal: Heavy-duty silicone gasket for consistent sealing
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Construction: Reinforced spring assembly for repeatable pressure retention
Fitments & Compatibility
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Fits all Subaru radiators and/or expansion tanks using the standard small-type cap interface
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Also compatible with many Nissan, Mitsubishi, Honda, Mazda, and Toyota applications sharing the same small-type neck design
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Note: Does not replace the earless, 1-way STI radiator cap — fits the upper expansion tank on those models
Usage Notes
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Installs just like the OEM cap — no modifications required
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Confirm that your radiator or expansion tank uses the small-type neck before installation
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