aFe Momentum GT Pro Dry S Cold Air Intake 51-76313 – BMW 135i / 335i (N55)

OVERVIEW

Want more power out of your N55? The aFe Power Momentum GT Pro DRY S cold air intake replaces the factory airbox on the BMW 135i, 335i and X1 35ix with a fully sealed system built for airflow. It flows 400 CFM at 7" H₂O, a 16% increase over stock, for gains of up to +12 horsepower and +14 lbs. x ft. of torque.

A one-piece roto-molded housing in heat-soak-resistant black cross-linked polyethylene eliminates the multi-piece factory box and keeps the intake charge cool, and a built-in sight window lets you check the filter without pulling anything apart. An auxiliary air inlet feeds additional cool air, with a urethane plug supplied if you would rather seal the box completely.

The system is built around the largest filter the space allows: a 9" tall inverted-top Pro DRY S element on a 6-3/4" x 4-3/4" oval flange, with three layers of progressively finer porosity synthetic media on a 100% polyurethane frame. Being oil-free, it needs no re-oiling after cleaning.

SPECS

• Measured airflow: 400 CFM @ 7" H₂O
• Dyno-tested gains: +12 HP and +14 lbs. x ft. of torque (peak)
• Outflows the factory intake by 16%
• Filter media: aFe Pro DRY S oil-free, 3-layer progressively finer porosity synthetic media (aFe P/N 21-90089)
• Filter size: 9" tall inverted-top element with a 6-3/4" x 4-3/4" oval flange
• Filter frame: 100% polyurethane for long life and multiple cleaning cycles
• Housing: one-piece CAD-designed roto-molded black cross-linked polyethylene, heat-soak resistant, with auxiliary air inlet and built-in filter sight window (aFe P/N 05-76313B2)
• Intake tube: CAD-designed, dyno-tuned roto-molded plastic (aFe P/N 05-76313B1)
• Urethane plug included to completely seal the airbox if desired
• Installation: direct bolt-on with aFe’s patent-pending filter-to-housing interface — no cutting or drilling of factory parts
• Emissions status: not CARB exempt at this time — not legal for sale in California or for use on any vehicle registered with the California Department of Motor Vehicles.

PARTS INCLUDED

• Pro DRY S air filter (21-90089) — 1
• Housing (05-76313B2) — 1
• Intake tube (05-76313B1) — 1
• Urethane plug (05-01225) — 1
• M4 Torx screw (03-50490) — 2

TECH RESOURCES

Additional Parts Required

• None. aFe Power specifies no additional hardware, tune or fluids for this intake — it is a direct bolt-on kit that requires no cutting or drilling of factory parts.
• Installer-supplied: basic hand tools, including a T-handle or driver for M4 Torx screws and a nut driver for the hose clamps.
• Optional service item: the Pro DRY S filter is washed and air-dried only — no filter oil is required.

Installation

• aFe Power 51-76313 / 54-76313 installation instructions (PDF)

Notes

• Year ranges above follow aFe Power’s current installation instructions, which are broader than the 2011–2012 range shown in the product title. Confirm fitment with Speed Logic before ordering.

PART NUMBER

• 51-76313 — Momentum GT intake with Pro DRY S filter (this listing)
• 54-76313 — same kit with the Pro 5R oiled filter

VEHICLE APPLICATIONS