aFe Momentum GT Pro Dry S Cold Air Intake 51-76312 – BMW 230i / 330i / 430i (B48 / B46)

OVERVIEW

The aFe POWER Momentum GT cold air intake replaces the restrictive factory airbox on BMW's B46/B48 turbocharged four-cylinder with a sealed one-piece roto-molded housing and a CAD-designed, dyno-tuned roto-molded intake tube. aFe records maximum gains of +13 horsepower and +12 lbs. x ft. of torque, with the system out-flowing the factory intake by up to 11%.

The smooth one-piece (patent pending) sealed housing draws through an auxiliary air scoop to ensure the coolest intake charge available, and a large clear sight window allows the filter to be inspected without disassembly. A durable aluminum heat-shield panel is secured to the housing to protect it from turbocharger heat.

Inside sits an 8-inch tall, 360-degree radial flow Pro DRY S air filter built from three layers of progressively finer porosity synthetic media - oil-free, washable and reusable. The patent-pending filter-to-housing interface allows the largest possible filter while simplifying assembly. Premium stainless steel clamps and a silicone bellow coupling finish the kit, and no cutting or drilling of factory parts is required.

SPECS

• +13 HP maximum gain (aFe measured)
• +12 lbs. x ft. torque maximum gain (aFe measured)
• Outflows the factory intake by up to 11%
• Filter media: Pro DRY S, oil-free 3-layer progressively finer porosity synthetic
• Filter size: 8 in. tall, 360-degree radial flow conical
• Filter is washable and reusable
• Housing: one-piece roto-molded sealed design with auxiliary air scoop and built-in sight window
• Aluminum heat-shield panel protects the housing from turbocharger heat
• Intake tube: CAD-designed, dyno-tuned, roto-molded
• Hardware: silicone double-hump coupling with stainless steel clamps
• No cutting or drilling of factory parts required for installation
• Emissions: not CARB exempt; not legal for sale in California or for use on California-registered vehicles

PARTS INCLUDED

• 1x Pro DRY S air filter (aFe 21-91103)
• 1x Intake housing (aFe 05-76309B2)
• 1x Intake tube (aFe 05-76312B1)
• 1x Rubber mount (aFe 03-50534)
• 2x M4 Torx screws (aFe 03-50490)
• 1x Silicone double-hump coupling (aFe 05-01416)
• 2x #052 hose clamps (aFe 03-50008)

TECH RESOURCES

Additional Parts Required

• None. aFe POWER specifies no additional hardware for this intake system - it is a complete bolt-on kit that reuses the factory mass air sensor and mounting points.
• Installer-supplied tools: metric socket and wrench set, Torx driver set, flat-blade screwdriver and pliers.
• Optional service item: a dry-media filter cleaning kit for periodic maintenance. Pro DRY S filters are cleaned dry and must never be oiled.

Installation

• aFe POWER 51-76312 / 54-76312 Momentum GT cold air intake - installation instructions (PDF)

Notes

• This intake system is not CARB exempt at this time and is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles.
• aFe's installation instructions state coverage as 330i/430i 2016–2020 and 230i 2017–2020; the ranges above follow Speed Logic's fitment data, which is broken out by individual body code. Please confirm your exact build with Speed Logic before ordering.

PART NUMBER

• 51-76312 - Momentum GT intake with Pro DRY S oil-free filter media (this listing)
• 54-76312 - identical kit supplied with Pro 5R oiled filter media; both numbers share aFe's installation document

VEHICLE APPLICATIONS