BMW & MINI Diesel B47/B37 Intake/Inlet Manifold Swirl Flap Delete Kit - Butterfly/Runner Valve Removal Blanking Plug, Delete Bolt + Seals - Fits F-Series & G-Series

Protect your BMW diesel with a proven intake manifold flap removal solution

Stop fragile intake runner flaps from breaking apart and being drawn into the cylinders. This Darkside kit is a simple, reliable way to remove the vulnerable intake butterfly flaps on BMW 4‑cylinder B47 and 3‑cylinder B37 engines, then securely blank the aperture for a clean, airtight finish. It is a popular reliability upgrade that helps avoid avoidable repair bills and keeps your BMW running sweetly.

We have installed this kit on customer cars and our own builds with excellent results. Owners report peace of mind, tidy airflow through the inlet, and zero fuss after fitting. If you want a dependable manifold flap blanking fix for your B47 or B37, this is the one to choose.

Why choose this intake flap removal and blanking kit

• Removes the weak intake runner flaps, a known failure point on B47 and B37 diesel units
• Prevents debris ingestion that can lead to costly engine damage
• Includes all required gaskets and seals for a proper, leak‑free reassembly
• Neat, permanent blanking solution using the supplied delete bolt
• Darkside quality, proven on road cars and performance builds

What is included

• 1 x Delete bolt for the inlet manifold blank
• 4 x Inlet seal gaskets OR 3 x Inlet seal gaskets
• 1 x EGR valve gasket

Fitment notes

The manifold aperture left by the flap assembly will need to be tapped to suit the supplied bolt. Professional installation recommended.

Need it fitted? Book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Compatibility

Engines: B47, B37, B37A, B37B

Platforms / chassis: F10N, F11N, F15, F20N, F21N, F22, F22N, F23, F23N, F25, F26, F30, F30N, F31, F31N, F32, F32N, F33, F33N, F34, F34N, F36, F36N, F39, F45, F45N, F46, F46N, F48, F48N, F54, F55, F56, F57, F60, G01, G02, G11, G12, G30, G31

Suitable across a wide range of BMW F‑series and G‑series applications including 1 Series, 2 Series, 3 Series, 4 Series, 5 Series, 7 Series, X1, X3, X4, plus compatible MINI diesel models listed above.

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Order with confidence. This is a straightforward, high‑value reliability upgrade for your BMW diesel that helps prevent damage, reduces risk, and keeps your car performing as it should.