BMW 6 Cylinder N57 / N57S Engine Aluminium Swirl Flap Delete Kit / Plug

Alloy Intake Manifold Blanking Plug for BMW 3.0-litre Diesel Straight Six

Protect your BMW’s 3.0d powerplant with this precision intake runner flap blanking solution designed for the N57 and N57S diesel straight six. If you are tackling intake swirl valve removal to prevent debris entering the cylinders, this billet alloy blank is the dependable, clean finish you want. It replaces the factory butterflies inside the manifold with a robust block-off plug that is retained by the original actuator housing for a secure, OE-style installation.

From our workshop experience and feedback from repeat customers, this upgrade is a firm favourite for reliability builds and preventative maintenance. It helps avoid the well-known risk of aged flaps coming loose and being drawn into the engine, while also promoting smoother airflow through the intake tract.

Why choose this blanking solution

• CNC-machined billet aluminium for strength, accuracy and long-term durability
• Direct-fit manifold block-off design that reuses the factory motor cover to hold the plug in place
• Supplied with all required sealing rings to complete the job properly
• Ideal when deleting intake swirl valves on performance or reliability-focused builds

What’s included

• 1 x Billet aluminium intake manifold blanking plug
• 6 x Inlet manifold seal gaskets

Compatible models and platforms

Engines: N57 and N57S 3.0-litre turbodiesel

Chassis and series: E70 LCI X5, E71 X6, E90 LCI, E91 LCI, E92 and E92 LCI, E93 and E93 LCI, F01, F02, F07 5 GT, F10 5 Series, F11 Touring

Typical model badges include 30d, 35d, 40d and 50d where fitted with the N57 family.

Benefits when removing intake runner flaps

• Reduces the risk of hard-part ingestion associated with worn swirl mechanisms
• Supports cleaner, smoother intake airflow for responsive diesel torque
• Great preventative upgrade during manifold cleaning or EGR and intake refresh

Fitting and support

Professional installation recommended. For fitting, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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For motorsport, off-road or where permitted. Ensure suitability for your specific vehicle configuration before ordering.