aFe POWER Magnum FORCE Stage-2 Pro DRY S Enclosed Cold Air Intake with Black Cover for BMW B58 3.0L (M140i, M240i, 340i, 440i | F20 F21 F22 F30 F31 F32 F34 F36) - 51-12912-B

BMW B58 3.0 Turbo Air Induction System - Black Cover - aFe POWER P/N 51-12912-B

Give your B58-powered BMW the airflow it deserves. This aFe POWER system replaces the restrictive factory airbox with a high-flow, sealed performance setup that feeds your turbo with cool, dense air for sharper response and real-world punch. Independent testing shows gains of up to 9 bhp and 10 lb ft, with a richer induction note and quicker spool for everyday driving and spirited runs alike.

We run this kit on our own builds and customer cars. Fitment is spot on, the quality is excellent and feedback has been overwhelmingly positive. If you are chasing a proven intake upgrade for your straight-six BMW, this is the one to choose.

Why enthusiasts choose this system

• Measured improvements - up to +9 bhp and +10 lb ft on the 3.0 turbo straight-six
• Serious flow - rated at 400 CFM at 7 in H2O for stronger midrange and top end
• Crisper throttle feel and addictive turbo sound without drone
• Sealed airbox keeps intake temperatures under control for consistent performance
• No cutting or drilling - true bolt-on installation using factory mounting points

Hardware highlights

• Oil-free Pro DRY S 3-layer synthetic media - easy to maintain, no mess
• 7 inch tall 360 degree conical performance filter for maximum surface area
• Roto-moulded, digitally modelled intake tube for smooth airflow and perfect fit
• Stealth black lid for an OEM plus look and reduced under-bonnet noise
• Auxiliary air inlet included with removable urethane plug to tailor airflow
• Premium clamps, couplers and all required hardware supplied

Official designation: aFe POWER Magnum FORCE Stage-2 Pro DRY S, Black Cover

Part number: 51-12912-B

Vehicle fitment - B58 petrol models

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

Installation and fitting

Direct replacement for the factory airbox. No cutting, no drilling, no coding. For professional installation and setup, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote.

Compatibility check

We will verify compatibility before dispatch. Add your UK registration number or the last 7 digits of your VIN at checkout and we will confirm fitment.

Manufacturer and warranty

Made by aFe. Supplied with a 1 year warranty.

Important notes

This product is not currently CARB exempt and is not available for sale in California or for use on any vehicle registered with the California Department of Motor Vehicle.

Why buy from MJ Modifications

Trusted UK specialist for BMW performance parts and installs. We have fitted and used this aFe B58 system on our own cars and customer vehicles with excellent results. Expert advice, friendly support and quick dispatch.

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