MMR Performance | BMW 60mm billet coolant cap | BMW

At PERON Automotive, we choose upgrades that deliver both quality and function—and the MMR Performance 60mm Billet Coolant Expansion Cap is no exception. Designed and engineered from the ground up in the UK, this cap is CNC-machined from solid billet aluminium to offer a premium feel and long-lasting durability.

Unlike simple stick-on covers, this is a true direct replacement for the OE cap, providing improved strength and aesthetics for your BMW’s cooling system. It’s the perfect finishing touch for a well-dressed engine bay.

Key Features:

• Designed and manufactured in the UK

• Precision-machined from solid billet aluminium

• Direct OE replacement – not a decorative cover

• Enhances both functionality and under-bonnet appearance

• Fits all BMW models with OE part number: 17 11 7 639 024

Whether you're upgrading for style or reliability, this billet cap adds a refined touch to your cooling system and pairs perfectly with MMR’s full engine dress-up range.