aFe Magnum FORCE Stage-2 Pro DRY S Cold Air Intake System - BMW 135i / 335i / X1 3.0L Turbo 2011-2015

aFe SKU: AFE51-31912
Price
Regular price $254.36
Regular price $356.25 Sale price $254.36
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The aFe Magnum FORCE Stage-2 intake replaces the factory upper airbox, tube and filter on the N55 3.0L turbo six with an aFe intake tube and a Pro DRY S filter that sits in the reused lower airbox. The filter uses three-layer oil-free synthetic media that is cleaned and reused without oiling. The factory mass air flow sensor moves to the aFe tube with two M4 screws.

Specifications

Type Cold Air Intake System
Series Magnum FORCE Stage-2
Filter Media Pro DRY S, three-layer oil-free synthetic, washable and reusable
Engine 3.0L turbo inline 6-cylinder (N55)
What's in the Box
  • Air filter (21-90083)
  • Intake tube
  • 2 M4 screws
Fitment Notes N55 engine only: 135i and 335i / 335i xDrive 2011-2013, X1 xDrive35i 2013-2015. The factory lower airbox is reused
Install Bolt-on with 6mm and 8mm nut drivers and a T25 Torx
Replacement Filter 21-90083 (Pro DRY S)
Filter Color Gray
Hardware Included Yes
Air Flow Gain 32 Percent
Pre-Filter 28-10153
Air Box Type Open
Heat Shield Included Yes
Tune Required No
Gains Up to +16 Horsepower hp and +26 Ft-Lbs lb-ft (aFe dyno)
Quantity 1 kit
Warranty 2 years on components (original owner)
Part Number 51-31912

This part fits:

Year Make Model Submodel
2011-2013 BMW 135i Base
2011-2013 BMW 335i Base
2011-2013 BMW 335i xDrive Base
2013-2015 BMW X1 xDrive35i

Documents: Installation Instructions (PDF)

Which BMW models does it fit?

  • The 2011-2013 BMW 135i, 335i and 335i xDrive and the 2013-2015 X1 xDrive35i with the N55 3.0L turbo.

Does it replace the whole airbox?

  • No. The upper airbox, tube and filter are replaced; the factory lower airbox is reused.

What is the replacement filter?

  • Part number 21-90083, a Pro DRY S filter that can be cleaned and reused.

Shipping

  • Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty

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