aFe Magnum FORCE Stage-2 Carbon Fiber Intake – BMW M3 (E90 / E92 / E93)

OVERVIEW

The aFe Power Magnum FORCE Stage-2 intake system replaces the restrictive factory intake tract on the E9X M3 with a carbon fiber tube and a large, high-flow performance air filter. aFe rates the kit at up to +12 horsepower and +9 lbs. x ft. of torque over the stock intake.

Rather than opening the filter to the engine bay, this system reuses the factory air box to seal the tube and filter away from under-hood heat, so the filter draws cool outside air while intake velocity and volume both increase. The uniquely shaped filter is sized to fill that box and flows 41% more air than the stock element.

The intake tube is high-gloss clear-coated 2x2 twill weave carbon fiber, shaped to keep factory fit and function while cutting weight, insulating against engine heat and dressing up the engine bay. A billet aluminum smog pump adapter, clamps, coupling and hardware are supplied, and the kit bolts on with no cutting or drilling of OEM parts.

SPECS

• Max gains: +12 HP and +9 lbs. x ft. torque
• Filter flows 41% more air than the stock element
• Filter media: Pro 5R washable and reusable oiled cotton gauze (part numbers beginning 54-)
• Filter size: 9-1/4" x 5-1/4" oval top, 5" tall, with a 7" x 3" opening
• Intake tube: high-gloss clear-coated 2x2 twill weave carbon fiber
• True cold air design: uses the factory air box as a sealed enclosure to isolate the filter from under-hood temperatures
• Billet aluminum smog pump adapter included for the factory smog pump fitting
• Direct bolt-on installation; no cutting or drilling of OEM parts
• Replacement filter per the aFe installation manual: Pro 5R R24-91086 (Pro DRY S equivalent R21-91086)

PARTS INCLUDED

• Pro 5R air filter (R24-91086)
• Carbon fiber air intake tube (05-31662C1)
• Hump coupling (05-01262)
• Clamp 104 (03-50051) x2
• Billet aluminum smog pump adapter (03-01096)
• Rubber grommet (05-50139)

TECH RESOURCES

Additional Parts Required

• None. aFe Power specifies no additional hardware for this intake; all clamps, couplings and hardware are supplied.
• No tune is required.
• Service item, not required: replacement Pro 5R filter R24-91086, or Pro DRY S R21-91086 if you prefer oil-free media.

Installation

• aFe Power 54-31662-C Magnum FORCE Stage-2 intake installation instructions (PDF)

Notes

• Part number 54-31662-C is the Pro 5R oiled filter version; the Pro DRY S version is 51-31662-C.

PART NUMBER

• 54-31662-C - Pro 5R oiled filter, carbon fiber intake tube
• 51-31662-C - Pro DRY S oil-free filter, same carbon fiber kit
• 52-31662-C - additional media variant listed on the same aFe installation manual

VEHICLE APPLICATIONS