aFe Power Magnum FORCE Stage-2 Pro 5R Intake | Cold Air/Induction Kit, Enclosed Airbox, Carbon-Effect Lid / Carbon Fibre Look | BMW B58 M140i M240i 340i 440i F20 F22 F30 F31 F32 F34 F36 2016-2019 xDrive | Performance Air Intake Filter | PN 54-12912-C

High-flow induction system with carbon-effect lid for BMW B58 straight-six

Give your B58-powered BMW the airflow it deserves with this sealed performance intake from aFe Power. Independent dyno testing has shown gains of up to +9 bhp and +10 lb ft with repeatable results on road and track. The closed airbox and carbon-style cover deliver cool, consistent charge air and a premium OEM-plus engine bay finish. Ideal for M140i, M240i, 340i and 440i owners chasing sharper throttle response, stronger mid-range pull and a refined turbo soundtrack.

Part number: 54-12912-C

Why this intake upgrade stands out

• Measured improvements: up to +9 bhp and +10 lb ft on the B58 inline-six
• Flows up to 11 percent more than the factory airbox for enhanced performance
• 400 CFM at 7 in H2O for reliable airflow under sustained load
• Sealed airbox with auxiliary fresh-air inlet to combat heat soak
• CAD designed, roto-moulded intake tube engineered for smooth, unrestricted flow
• Pro 5R oiled 5-layer cotton gauze conical filter for maximum airflow
• Vacuum-formed ABS carbon-effect lid for a clean, factory-plus look
• Direct bolt-on install using standard tools, no cutting or drilling

In the box

• Roto-moulded intake tube, sealed airbox and carbon-effect cover
• 7 in tall 360-degree radial flow performance filter
• Auxiliary air inlet with optional urethane block-off plug
• All required clamps, couplers and hardware

Real-world feedback

We have fitted this system to our own B58 projects and many customer cars. Fit and finish are spot on, the sealed design keeps intake temps in check for daily driving, and the intake tone under boost is just right. Owners pairing this with software and exhaust upgrades report a noticeable improvement in drivability and mid-range urgency.

Vehicle applications

For BMW models with the 3.0 turbocharged B58 engine, model years 2016 to 2019, including xDrive where listed:

• BMW 340i L6 3.0 Turbo B58 {F30/F31} 2016–2019
• BMW 340i GT L6 3.0 Turbo B58 {F34} 2016–2019
• BMW 340ix L6 3.0 Turbo B58 xDrive {F30/F31} 2016–2019
• BMW 340ix GT L6 3.0 Turbo B58 xDrive {F34} 2016–2019
• BMW 440i L6 3.0 Turbo B58 {F32} 2016–2019. Does not fit Convertible
• BMW 440i Gran Coupe L6 3.0 Turbo B58 {F36} 2016–2019
• BMW 440ix L6 3.0 Turbo B58 xDrive {F32} 2016–2019. Does not fit Convertible
• BMW 440ix Gran Coupe L6 3.0 Turbo B58 xDrive {F36} 2016–2019
• BMW M140i L6 3.0 Turbo B58 {F20/F22} 2016–2019
• BMW M140ix L6 3.0 Turbo B58 xDrive {F20/F22} 2016–2019
• BMW M240i L6 3.0 Turbo B58 {F22} 2016–2019. Does not fit Convertible
• BMW M240ix L6 3.0 Turbo B58 xDrive {F22} 2016–2019. Does not fit Convertible

Technical data

• Filter media: Pro 5R oiled, 5-layer progressively finer cotton gauze
• Filter height: 7 in conical, 360-degree radial flow
• Tube: CAD designed, roto-moulded for optimised flow and fit
• Cover: vacuum-formed ABS with carbon-effect finish and auxiliary air inlet
• Flow rating: 400 CFM at 7 in H2O
• Installation: direct bolt-on

Professional fitting

DIY friendly with basic tools. For a hassle-free install, book professional fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Alternative finish

Prefer an understated look. A stealth black cover variant is also available.

Compatibility check before dispatch

We verify fitment before shipping. Add your UK registration or last 7 of your VIN at checkout so we can confirm suitability for your specific B58 model.

Manufacturer and warranty

• Brand: aFe Power
• Warranty: 1 year

Dimensions and weight

• Box size: 44 cm x 33 cm x 33.5 cm
• Weight: 2.8 kg

Legal notice

Not currently CARB exempt. Not for sale in California or for use on vehicles registered with the California Department of Motor Vehicles.

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