MMX Performance Billet Air Conditioning Caps

The MMX Billet Air Conditioning Caps are designed to replace the factory-fitted plastic AC caps found on BMW and MINI models, offering a durable, refined alternative to a commonly overlooked weak point in the engine bay.

Over time, OEM plastic AC caps can become brittle due to heat cycles, age, and repeated removal. This can lead to cracking, poor sealing, and an untidy appearance. MMX billet caps eliminate these issues with a long-lasting aluminum solution that improves both function and aesthetics.

Each cap is CNC-machined from high-quality 6061-T6 aluminum, finished in anodized black, and hand-polished to match the MMX billet aluminum engine bay range. A subtle engraved MMX “X” logo provides a clean OEM+ detail.

MMX offers direct replacements for both OEM AC cap types, ensuring compatibility across BMW and MINI platforms, including older R134A systems using black OEM caps and newer R1234YF systems using grey OEM caps (circa 2017+).

Designed as true OEM replacements, the caps are pre-sealed and install in seconds with no modification required. They are fully reversible and can be removed or returned to stock just as easily. No AC system re-gas is required at any stage, simply remove the factory caps and install the MMX billet versions.

Product Features

• CNC-machined from 6061-T6 aluminum
• Anodized black finish with engraved MMX “X” logo
• Direct OEM replacement design
• Pre-sealed for easy installation
• Fully reversible, returns to stock in seconds
• Designed to match the MMX billet aluminum engine bay range
• No AC system re-gas required

Compatibility

R134A Systems (Black OEM Caps)
OEM part numbers: 64 53 8 397 437 and 64 53 8 387 438

R1234YF Systems (Grey OEM Caps)
OEM part numbers: 07 14 9 287 978 and 07 14 9 287 979

Fitment Disclaimer

While every effort has been made to ensure accurate vehicle information, customers are responsible for verifying compatibility with their specific vehicle and engine variant prior to purchase.