Aluminum Adaptor Fitting Plugs for BMW E46 318d 320d 330d

The Aluminum Adaptor Fitting Plug for BMW E46 318d 320d 330d is a targeted replacement part designed to refresh your diesel BMW’s intake system without replacing the entire assembly. Crafted for durability, this adaptor clamps neatly into place, helping restore peak performance where worn fittings have caused leaks or airflow restrictions.

Key benefits include cooler inlet air and improved flow characteristics, which support more efficient combustion and responsive acceleration. By reducing the risk of debris and clogging in the inlet and turbo, this adaptor helps maintain steady boost and throttle response, especially as engines rack up miles. The result is a more dependable driving experience with fewer intermittent faults from aging fittings.

Designed for diesel engines only, this adaptor is not compatible with petrol models. It is CNC machined from a single aluminum billet for rigidity and precision, and finished in a silver color that blends with OEM hardware. The part is intended to fit a broad range of BMW diesel engines and applicable model lines, ensuring a straightforward upgrade where original fittings have degraded.

Fitment — This adaptor is suitable for BMW 1 Series, 3 Series, 5 Series, 7 Series, X3, X5, and X6 lines. It is intended to fit the following engine codes (you can find the code on a sticker on the Cam Belt Cover or in the Boot):

• BMW engines M47, M47N, M57, M47N2, M67, M47R
• 3 Series E46 318d (2001–2005), 318td (2002–2004), 320d (1997–2005), 320cd (2003–2006), 320td (2000–2004), 330d (1998–2003), 330xd (2000–2003)
• 5 Series E39 520d (1999–2003), 525d (1999–2003), 530d (1997–2003)
• X5 E53 3.0d (2000–2003)
• X3 E83 2.0d (2003–2006)
• E38 7 Series 730d (1997–2001), 740d (1998–2001); E65 7 Series 740d (2001–2005)

Specifications highlight that the adaptor is CNC machined from a single aluminum billet, finished in silver, and built to the diesel-specific tolerances of the listed engine families. This part is marketed as a direct-fit upgrade to restore or enhance airflow in the intake path while maintaining compatibility with the listed BMW models.

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Benefits & Tips

• Use as a targeted replacement to avoid full intake system overhaul and reduce downtime during maintenance.
• When installing, verify the engine code and fitment to ensure compatibility with diesel BMWs listed above.
• For best results, have a professional install if you are unsure about DIY mounting and seal checks.

Product specifications

• Material: Aluminum
• Color: Silver
• Model Number: BOP40
• Origin: Mainland China
• Application: Diesel BMW engines (not petrol)
• Machining: CNC machined from a single aluminum billet
• Includes: Aluminum adaptor plug for BMW diesel engines

Package includes:

• 1 x Aluminum Adaptor Fitting Plug for BMW diesel engines (E46 318d/320d/330d and listed diesel engines)

Warnings/Reminders

• This item is for diesel vehicles only and is not suitable for petrol engines.
• No installation instructions are included; Do It Yourself (DIY) guidance is not provided. Professional installation is highly recommended.