aFe Stage 2 Pro Dry S Intake – BMW M3 (E90 / E92)

OVERVIEW

For the largest possible performance gain from an intake on the S65 V8, the aFe POWER Magnum FORCE Stage-2 system replaces the factory intake tract with a dyno-tuned aFe tube and an open-element Pro DRY S air filter. aFe records maximum gains of +12 horsepower and +9 lbs. x ft. of torque, with the system out-flowing the factory intake by 41%.

The design avoids the floating tubes used by lesser kits: a built-in ram scoop forces cold air into the filter for greater efficiency and real-world gains, and raised clamp stops on the aFe tube provide a more secure seal that eliminates the slippage common to flat, straight tubes. A specially developed 3-angle velocity stack adapter dramatically increases airflow from the filter into the intake tube.

This version is supplied with the Pro DRY S element - an oil-free, washable and reusable filter using progressively finer porosity synthetic media, chosen for maximum convenience since it never needs re-oiling. aFe uses only top-quality hardware such as stainless steel button head bolts and brass inserts, and the system carries CARB Executive Order D-550-38, making it 50-state legal on the applications listed below.

SPECS

• +12 HP maximum gain (aFe measured)
• +9 lbs. x ft. torque maximum gain (aFe measured)
• Out-flows the factory intake by 41%
• Filter media: Pro DRY S, oil-free progressively finer porosity synthetic
• Filter is washable and reusable; never requires oiling
• Open-element Stage-2 design replaces the factory intake tract
• Built-in ram scoop forces cold air into the filter
• 3-angle velocity stack adapter increases flow from filter to tube
• Raised clamp stops on the intake tube prevent coupler slippage
• Hardware: stainless steel button head bolts and brass inserts
• Emissions: 50-state legal under CARB EO# D-550-38

PARTS INCLUDED

• 1x Pro DRY S air filter (aFe 21-90061)
• 1x Intake tube (aFe 05-31662B1)
• 2x #104 clamps (aFe 03-50051)
• 1x Silicone hump coupling (aFe 05-01262)
• 1x Smog pump fitting (aFe 05-01096)
• 1x Rubber grommet (aFe 03-50139)

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, hex/Allen key 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 51-31662 / 54-31662 / 52-31662 Magnum FORCE Stage-2 intake - installation instructions (PDF)

Notes

• aFe POWER's official application data covers the 2008–2013 M3 (E90/E92/E93). Please confirm your exact build with Speed Logic before ordering.

PART NUMBER

• 51-31662 - Magnum FORCE Stage-2 intake with Pro DRY S oil-free filter media (this listing)
• Identical kit supplied with Pro 5R oiled filter media — 54-31662
• Same kit in aFe's alternate media designation; all three numbers share aFe's installation document — 52-31662

VEHICLE APPLICATIONS