aFe Momentum GT Pro Dry S Cold Air Intake – BMW 340i / 440i / M240i (F30 / F32 / F22, B58)

OVERVIEW

aFe Power's Momentum GT cold air intake for the B58 replaces the factory airbox with a sealed, high-flow system rated at 400 CFM at 7" H2O. aFe measured maximum gains of +13 horsepower and +13 lbs. x ft. of torque, with the system outflowing the stock intake by up to 13%.

The smooth one-piece roto-molded housing is sealed and fitted with an auxiliary air scoop, eliminating the multi-piece construction of a factory box and drawing the coolest available charge. A large clear sight window built into the housing allows filter inspection without disassembly, and the patent-pending filter-to-housing interface maximizes usable filter area while keeping the part count low.

This version uses the oil-free Pro DRY S element: a large 8-3/4" oval, 360-degree radial-flow filter with three layers of progressively finer porosity synthetic media. It needs no oiling and washes clean with soap and water. A CAD-designed, dyno-tuned roto-molded intake tube connects to the turbo, a custom high-temperature reinforced silicone elbow coupling adapts to the factory breather line, and premium stainless-steel clamps secure the assembly. No cutting or drilling of factory parts is needed.

SPECS

• 400 CFM rating @ 7" H2O
• Maximum gains: +13 HP and +13 lbs. x ft. torque
• Outflows the factory intake by up to 13%
• Filter: Pro DRY S, 8-3/4" oval, 360-degree radial flow, oil-free
• Filter media: three layers of progressively finer porosity synthetic media, washable and reusable
• Housing: one-piece roto-molded sealed housing with auxiliary air scoop
• Built-in sight window for filter inspection without disassembly
• Patent-pending filter-to-housing interface
• Intake tube: CAD-designed, dyno-tuned, roto-molded
• Custom high-temperature reinforced silicone elbow coupling for the factory breather line
• Premium stainless-steel clamps
• No cutting or drilling of factory parts
• Not CARB exempt

PARTS INCLUDED

• Pro DRY S air filter (21-91103) — 1
• Intake housing (05-76309B2) — 1
• Intake tube (05-76309B4) — 1
• Screw, Torx M4 (03-50490) — 2
• Clamp, #060 (03-50002) — 2
• Silicone double-hump coupling (05-01417) — 1
• Rubber mount (03-50534) — 1

TECH RESOURCES

Additional Parts Required

• None. aFe Power specifies no additional hardware for this intake — it is a complete bolt-on kit.
• Installer supplies basic hand tools: metric sockets and wrenches, Torx drivers and a trim tool for the engine cover clips.
• Optional service item: aFe Pro DRY S filter cleaning kit (water-based, no oil) for periodic filter maintenance.

Installation

• aFe Power 51-76309 / 54-76309 Momentum GT cold air intake — installation instructions (PDF)

Notes

• Note: 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 Power states this air intake system will not fit convertible models. Year ranges above follow aFe's official installation instructions. Confirm fitment with Speed Logic if your car is a borderline model year or a non-US market variant.

PART NUMBER

• 51-76309

VEHICLE APPLICATIONS