Description
Enhance both the function and appearance of your BMW engine bay with the MMX Performance Billet Coolant Expansion Cap. Designed and engineered in the UK, this cap is a true OE replacement that offers a high-quality, durable upgrade to the fragile plastic factory cap.
Crafted from a solid billet of 6061 aerospace-grade aluminium, the cap is precision-machined using the latest CNC 5-axis technology. Once machined, it's polished and finished with MMX's signature gloss black anodizing, ensuring it remains looking sharp year after year while providing a strong, corrosion-resistant seal.
This cap includes pre-installed OE spec valve and internal spring, making it a complete plug-and-play solution. The internal spring ensures that you can securely tighten it without worrying about oil or coolant leaks. The design also incorporates an easy-grip surface for comfortable installation and maintenance.
Whether you're replacing an aging factory part or completing an under-hood aesthetic overhaul, the MMX Performance Billet Coolant Expansion Cap is the perfect upgrade.
Product Features:
- Designed and engineered in the UK
- Crafted from 6061 aerospace-grade aluminium for long-lasting durability
- Full OE replacement – no parts or modifications needed
- Pre-installed internal spring and OE spec valve for secure fit
- Anodized in MMX’s signature gloss black for corrosion resistance
- Pre-installed factory-spec Viton O-ring for optimal sealing
- Complements other MMX billet products for a complete under-hood transformation
Fitment:
Compatible with BMW models using the following OE part numbers:
- 90mm Fitment (replaces OE part number 17117639021)
- 60mm Fitment (replaces OE part number 17117639024)
