The Precision Raceworks Billet Coolant Cap Set is a functional and stylish upgrade for any engine bay, crafted from durable billet aluminum for long-lasting protection. These caps incorporate the OEM pressure relief internals, ensuring safe and reliable operation while delivering a performance-grade appearance.
Available in three color options—Black with Billet, Black with Blue, and the all-black Stealth series—these caps require assembly and swapping the pressure relief valves from your original caps. They are designed to fit BMW F-Series and G-Series models, as well as Toyota Supra, and offer a precise fit every time.
Key Features
| Material | Billet aluminum |
| Product Type | Fluid Caps |
| Brand | Precision Raceworks |
| Compatibility | BMW F-Series, G-Series, Toyota Supra |
| Color Options | Black with Billet, Black with Blue, Stealth (all black) |
| Assembly Required | Yes, requires swapping pressure relief valves from original caps |


Highlights
- Durable billet aluminum construction
- Incorporates OEM pressure relief internals for safe operation
- Available in three color options: Black with Billet, Black with Blue, and Stealth (all black)
- Designed for BMW F-Series, G-Series, and Toyota Supra
- Requires assembly and swapping of pressure relief valves from original caps
Compatibility
Fitment NoteIf the primary expansion tank cap matches this design:

A different coolant expansion tank cap is required to serve as the donor cap.
BMW Part number 17117639021

How to use
To install, remove the pressure relief valves from your original coolant caps and swap them into the new billet caps. Ensure the valves are securely seated before installing the caps onto the expansion tank.
Frequently asked questions
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