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5-star Rated Mmx Performance - Mmr 90mm Billet Coolant Expansion Cap | Bmw Eco-friendly [rIVP1uY0]

$32.99 $105.99 -69%

MMR Performance Billet Coolant Expansion Cap Elevate the visual appeal and functionality of your BMW with the MMR Performance 90mm Billet Coolant Expansion Cap. Crafted with precision in the UK, this high-quality accessory is designed to replace the

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5-star Rated Mmx Performance - Mmr 90mm Billet Coolant Expansion Cap | Bmw Eco-friendly [rIVP1uY0]

MMR Performance Billet Coolant Expansion Cap

Elevate the visual appeal and functionality of your BMW with the MMR Performance 90mm Billet Coolant Expansion Cap. Crafted with precision in the UK, this high-quality accessory is designed to replace the original equipment cap, providing a seamless fitment for models with the matching OE part number (17 11 7 639 021). The cap is not just a cosmetic upgrade but a robust solution for your vehicle's cooling system.

Unmatched Quality and Design

Each MMR cap begins as a solid billet of 6061 aerospace-grade aluminium, meticulously machined with the latest CNC 5-axis technology. This ensures precision and durability, making it a long-lasting addition to your BMW. The cap is then polished and gloss-anodised in a deep, glossy black finish, enhancing the aesthetics of your engine bay. Key features include:

  • Engineered in the UK for superior quality and craftsmanship.
  • Crafted from 6061 aerospace-grade aluminium for unmatched strength and durability.
  • Full OE cap replacement for a perfect fit and functionality.

Convenience and Performance

The MMR Billet Coolant Expansion Cap is designed for easy installation and use. It arrives pre-sealed and pre-installed with an OE spec valve and internal spring, eliminating the need for complex modifications. This plug and play solution ensures a hassle-free upgrade. The cap's design offers ample surface grip for easy handling, simplifying the installation and filling process. Additional benefits include:

  • Sophisticated internal springing and bleed off for optimal performance.
  • Anodised in MMR signature gloss black for a sleek and modern look.
  • Joins existing range of MMR billet caps for a complete engine bay transformation.

What Our Customers Say

February 2, 2026

Absolutely no complaints!

This has been a wonderful surprise.

- Valentina D..

February 2, 2026

Absolutely no complaints!

A very useful and durable product.

- Hailey T..

February 2, 2026

Absolutely no complaints!

It’s a joy to use this product.

- Colton S..

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