aFe 51-12912-B Magnum FORCE Stage-2 Cold Air Intake for 2016-2020 BMW B5

Vehicle Fitment

• 2016-2018 BMW 340i (L6 3.0L B58 turbo gasoline)
• 2016-2018 BMW 340i xDrive (L6 3.0L B58 turbo gasoline)
• 2017-2021 BMW M240i (L6 3.0L B58 turbo gasoline)
• 2017-2021 BMW M240i xDrive (L6 3.0L B58 turbo gasoline)
• 2017-2019 BMW 340i GT xDrive (L6 3.0L B58 turbo gasoline)
• 2017-2020 BMW 440i (L6 3.0L B58 turbo gasoline)
• 2017-2020 BMW 440i xDrive (L6 3.0L B58 turbo gasoline)
• 2017-2020 BMW 440i Gran Coupe & xDrive Gran Coupe (L6 3.0L B58 turbo gasoline)
• 2017-2019 BMW M140i (L6 3.0L B58 turbo gasoline)

Features

• Magnum FORCE Stage-2 cold air intake engineered to improve airflow and turbo response
• Pro DRY S dry synthetic media air filter - washable and reusable, no oiling required
• 7" tall 360° radial filter for increased surface area and airflow
• High-quality, dyno-tuned roto-molded intake tube for optimized air delivery
• Lightweight vacuum-formed plastic cover with auxiliary air inlet for a stealth look
• Included urethane plug allows blocking auxiliary inlet for temperature tuning
• Direct bolt-on installation - no cutting or drilling required
• Premium clamps, couplings, and all mounting hardware included

Specifications

• Part Number: 51-12912-B
• Brand: aFe Power
• Series: Magnum FORCE Stage-2
• Filter Type: Pro DRY S dry synthetic media
• Filter Size: ~7" tall 360° radial flow
• Estimated Airflow Increase: Outflows factory intake (rated ~400 CFM @ 7" H2O)
• Estimated Performance Gains: Up to +9 HP & +10 lb-ft torque
• Intake Tube: Roto-molded plastic
• Heat Shield: Vacuum-formed plastic cover design
• Fitment: Direct-fit for BMW turbo B58 3.0L models listed above
• Emissions: Not CARB exempt - not legal for sale/use in California or CARB-equivalent states

Included Components

• 1x Pro DRY S dry synthetic performance air filter
• 1x Roto-molded intake tube
• 1x Vacuum-formed plastic cover with auxiliary inlet
• Premium stainless-steel clamps
• Silicone couplings
• Urethane auxiliary inlet plug
• All required mounting hardware

Product Description

The aFe Power 51-12912-B Magnum FORCE Stage-2 Cold Air Intake System is a high-flow performance upgrade designed specifically for BMW models powered by the 3.0 L B58 turbocharged inline-six - including the 340i, M240i, 440i, and related xDrive and Gran Coupe variants from 2016 through 2020. This Stage-2 intake replaces the restrictive factory intake with a large, high-flow Pro DRY S dry synthetic filter and a precision roto-molded intake tube to enhance airflow and turbo response without requiring ECU tuning.

Featuring a tall 7" radial flow filter for increased surface area and a lightweight vacuum-formed cover with an auxiliary inlet, the 51-12912-B draws in cooler, denser air while maintaining a stealthy under-hood appearance. The included urethane plug lets you block the auxiliary inlet for intake air temperature tuning. With measured airflow improvements and estimated gains of up to around +9 HP and +10 lb-ft of torque, this intake also offers a more engaging induction sound compared to stock. Installation is simple and direct bolt-on with all hardware included, though this system is **not CARB exempt** and is **not legal for sale or use in California or CARB-equivalent emissions-controlled states**.