BMW B58 Induction Kit – aFe Power Magnum FORCE Stage-2 Pro DRY S Cold Air Intake, Carbon-Fibre Look, Sealed Airbox for M140i M240i 340i 440i (F20 F21 F22 F30 F31 F32 F34 F36) 2016-2019 | Performance Intake System | 51-12912-C

BMW B58 Induction System Upgrade with Carbon-Effect Cover for M140i, M240i, 340i, 440i

Give your B58 straight six the airflow it deserves with this sealed performance intake from aFe. Designed for F-series M140i, M240i, 340i and 440i models, this enclosed system replaces the restrictive factory airbox with a high flow, oil-free filtration setup and a smooth roto-moulded intake tube for proven gains, sharper throttle response and a richer induction note while keeping heat soak in check. Perfect for daily driving and spirited road use alike.

Part number: 51-12912-C

What you will feel and hear

• Measured improvements of up to +9 bhp and +10 lb ft on the B58 3.0 turbo
• Faster pedal response and stronger mid-range pull
• Deeper turbo induction sound without the drawbacks of an open cone
• Consistent performance thanks to a sealed airbox that helps manage under-bonnet heat

Why enthusiasts choose this aFe intake

• High flow, oil-free 3 layer Pro DRY S filter element for maximum convenience
• Roto-moulded, CAD-optimised intake tube for smooth, stable airflow and OE-grade fit
• Carbon-effect ABS lid for a premium engine bay look
• Auxiliary air inlet with removable plug so you can tailor airflow to your preference
• Direct bolt-on installation with quality clamps and couplers included
• Dyno tested airflow of 400 CFM at 7 inches H2O

We have fitted this kit for customers and on our own B58 cars and the feedback is consistently positive. Expect improved drivability, cleaner turbo spool and a smart OEM-plus finish under the bonnet.

Technical details

• Filter: Pro DRY S, oil-free 3 layer synthetic, 7 inch tall, 360 degree radial flow
• Intake tube: dyno-tuned roto-moulded design
• Airbox cover: vacuum formed ABS with carbon-look finish and auxiliary air opening
• Airflow: 400 CFM at 7 inches H2O
• Gains: up to +9 bhp and +10 lb ft
• Manufacturer warranty: 1 year
• Part reference: 51-12912-C

Prefer a stealth finish? This system is also available with a black cover option.

Compatibility

For BMW F-series models with the B58 3.0 turbo petrol engine:

• BMW 340i L6 3.0 F30 F31 2016–2019
• BMW 340i GT L6 3.0 F34 2016–2019
• BMW 340i xDrive L6 3.0 F30 F31 2016–2019
• BMW 340i xDrive GT L6 3.0 F34 2016–2019
• BMW 440i L6 3.0 F32 2016–2019 — not for Convertible
• BMW 440i Gran Coupe L6 3.0 F36 2016–2019
• BMW 440i xDrive L6 3.0 F32 2016–2019 — not for Convertible
• BMW 440i xDrive Gran Coupe L6 3.0 F36 2016–2019
• BMW M140i L6 3.0 F20 F21 2016–2019
• BMW M140i xDrive L6 3.0 F20 F21 2016–2019
• BMW M240i L6 3.0 F22 2016–2019 — not for Convertible
• BMW M240i xDrive L6 3.0 F22 2016–2019 — not for Convertible

Fitting and support

This is a straightforward plug-and-play upgrade with no cutting or drilling required. All hardware is supplied.

Want it installed by specialists? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Order with confidence

• If you would like us to verify compatibility, send your UK registration or last 7 of your VIN at checkout.
• Backed by aFe’s 1 year manufacturer warranty.
• Easy to reference part number: 51-12912-C.

Emissions notice

This product is not currently CARB exempt and is not available for sale in California or for vehicles registered with the California Department of Motor Vehicles.

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