aFe 51-76309 Momentum GT Cold Air Intake for 16-21 BMW 340i/440i/M240i B58

Vehicle Fitment

• 2016-2018 BMW 340i (F30/F31, B58 3.0L Turbo)
• 2016-2018 BMW 340i xDrive (F30/F31, B58 3.0L Turbo)
• 2017-2020 BMW 440i (F32/F33, B58 3.0L Turbo)
• 2017-2020 BMW 440i xDrive / Gran Coupe (F32/F33/F36, B58 3.0L Turbo)
• 2017-2021 BMW M240i / M240i xDrive (F22/F23, B58 3.0L Turbo)

Features

• Direct-fit aFe Momentum GT Pro DRY S cold air intake engineered for increased airflow and throttle response
• One-piece sealed housing with auxiliary air inlet and large sight window for quick visual filter inspection
• Large oil-free Pro DRY S synthetic 3-layer performance air filter - washable and reusable
• CAD-designed, dyno-tuned roto-molded intake tube for optimized airflow and reduced turbulence
• Lightweight carbon fiber trim on housing for motorsport-inspired appearance
• Premium silicone bellows and high-temp reinforced couplings for secure fitment
• Premium stainless-steel T-bolt clamps provide secure, vibration-resistant installation
• Outflows stock intake up to ~28 % and offers dyno-proven gains of up to +13 HP and +13 lb-ft torque

Specifications

• Part Number: 51-76309
• Brand: aFe Power Momentum GT Pro DRY S Series
• Compatible Years: 2016-2021
• Make: BMW
• Models/Platforms: 340i, 340i xDrive, 440i, 440i xDrive/Gran Coupe, M240i, M240i xDrive
• Engine: B58 3.0L Turbo inline-6
• Filter Media: Pro DRY S synthetic, washable/reusable
• Housing Material: Cross-linked polyethylene sealed housing with carbon fiber trim
• Intake Tube: CAD-designed roto-molded plastic
• Estimated Performance Gains: ~+13 HP and ~+13 lb-ft torque
• Airflow Improvement: Up to ~28 % over factory intake
• Emissions: Not CARB exempt - not legal for sale/use in California and certain states

Included Components

• 1x One-piece sealed intake housing with auxiliary air inlet
• 1x CAD-designed roto-molded intake tube
• 1x Pro DRY S washable/reusable synthetic air filter
• 1x Sight window integrated into housing
• 1x High-temp silicone bellows coupling
• 2x Stainless-steel T-bolt clamps
• Installation hardware kit

Product Description

The aFe 51-76309 Momentum GT Cold Air Intake with Pro DRY S filter is a direct-fit performance intake system engineered for BMW models equipped with the B58 3.0L turbocharged engine, including 340i, 440i, and M240i variants produced from 2016 through 2021. This Momentum GT system replaces the factory airbox with a one-piece sealed housing and dyno-tuned intake tube designed to significantly improve airflow and throttle response. The included Pro DRY S synthetic air filter is washable and reusable, providing both strong filtration and easy maintenance.

Featuring a large, oil-free 3-layer filter and premium hardware, the intake outflows the factory system by up to approximately 28 %, contributing to dyno-proven gains of up to +13 HP and +13 lb-ft of torque under ideal conditions. The housing also incorporates lightweight carbon fiber trim for a sportier look while the integrated sight window simplifies visual inspection of the filter without disassembly. This bolt-on upgrade installs using factory mounting points with no cutting or drilling required. Note that this intake is not currently CARB exempt and may not be legal for sale or use in California and certain other states; always verify local emissions regulations prior to purchase.