aFe 54-31912 Magnum FORCE Stage-2 intake combines one Pro 5R oiled filter and molded tube for qualified E-series BMW N55 3.0L turbo applications. The original lower airbox and original downstream coupling remain. The optional black cover is separate, so the selected intake is not supplied as a newly enclosed replacement airbox.
Current exact primary identifies 135i E82/E88 and 335i E90/E92/E93 2011-2013, plus X1 E84 2013-2015, N55 3.0L turbo. Own manual lists X1 2011-2015, but the original later 2013-2015 xDrive35i range remains and earlier-market proof is held. Existing 335i/335i xDrive Base model rows remain conditional on actual E-series N55 chassis; exact selected-part chassis tables distinguish E90 2011 from E92/E93 through 2013. All original four application rows, gaps and bounds remain. Indexed selected-part 135i M Sport evidence remains a named-configuration follow-up; no package-to-trim or related dry-part inference is used. No N54, 335is, M-model or F-series application is newly approved.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2011-2013 | BMW | 135i | Base |
| 2011-2013 | BMW | 335i | Base |
| 2011-2013 | BMW | 335i xDrive | Base |
| 2013-2015 | BMW | X1 | xDrive35i |
Verify 54-31912 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 54-31912 |
| Product line | Magnum FORCE Stage-2 |
| Selected filter | One 24-90083 Pro 5R; five oiled cotton-gauze layers |
| Filter dimensions | Oval 7 x 3-inch flange; 5-inch height; replacement listing |
| Tube | 05-31912B1; molded intake tube |
| Sensor hardware | Two 03-50490 M4 screws; length not stated in own bill |
| Original interface | Lower airbox, downstream coupling and original MAF sensor retained |
| Optional cover | 54-31918-B; separate accessory, not included |
| Original clips | Keep four original metal clips when fitting optional cover |
| Airflow evidence | No current linked flowchart establishes baseline, pressure or numeric increase |
| Dyno qualification | Marked +15.67 hp / +25.70 lb-ft at different rpm points; run-max differences +3.58 hp / +34.01 lb-ft |
| Emissions | Current manufacturer/manual: not CARB exempt; California restriction |
| UPC | 802959507032 |
| WARNING | This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov. |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 24-90083 | Selected Pro 5R oiled filter |
| 1 | 05-31912B1 | Molded intake tube |
| 2 | 03-50490 | M4 sensor screws; length not specified |
The alternate dry filter in the shared bill is not a second selected filter. No new lower airbox, cover, downstream coupling, MAF sensor or separate gasket is itemized, despite generic coupler flags and sealed-system overview wording. Original lower airbox and coupling remain. The filter clamp shown in the procedure is supplied with the filter. Black foam tape is mentioned as an optional fit/protection measure but is not itemized in the selected bill; do not promise it as supplied. Shared manual includes the 52-series family number as well as both selected media versions.
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
One 24-90083 Pro 5R oiled filter with five cotton-gauze layers, oval 7 x 3-inch flange and 5-inch height.
Is a new airbox or coupling included?No new lower airbox or downstream coupling is itemized; both original components remain.
Which sensor transfers?The original MAF transfers using two supplied M4 screws. The own bill does not specify screw length.
When should MAF be reconnected?Reconnect its harness first, before inserting the new tube end into the original coupling.
Should the four original metal clips remain?Keep them for the optional cover. The exact procedure permits removing them when running the intake without a cover.
Is black foam tape guaranteed in the box?No. The procedure mentions optional fit/protection use but does not itemize it in the selected bill.
Does the linked dyno include the optional cover?No. The intake run explicitly says No Cover; marked gains and run-max differences are separately qualified.
What torque and follow-up apply?The exact intake manual specifies no numeric torque or mileage interval. Verify MAF connection, tube support and clamp engagement.
Verify aFe 54-31912. Read all twelve pages and figures A-E. Work cool and observe the negative-battery disconnection warning. Unclip original airbox in four places and loosen the first hose clamp after MAF. Lift original tube enough to disconnect MAF harness, then remove original tube and filter while leaving lower airbox in place. Keep all four metal clips if installing the optional cover; when running without cover, the manual permits removing clips by closing fully and pushing down firmly. Remove original MAF using T25 and pull sensor straight out. Install it in supplied tube using both supplied M4 screws. Fit selected oiled filter onto tube as one assembly. Reconnect MAF harness FIRST, then insert tube end into original coupling. Press tube into position over original airbox edge and secure clamps. Optional black foam tape may protect original box surface or improve tube-to-box fit, but is not itemized as supplied. Verify sensor, tube support and clamp engagement and restore battery connection. No numeric torque or mileage recheck interval is specified in this intake manual; do not borrow the separate cover 100-mile instruction as this intake own interval.
Current primary advertises 16 hp and 26 lb-ft gains; actual linked 2011 335i N55 dyno marks 192.93 versus 177.26 hp near 3100 rpm and 316.64 versus 290.94 lb-ft near 3300 rpm, differences 15.67 hp and 25.70 lb-ft at different points. Run maxima are 280.21 versus 276.63 hp and 333.31 versus 299.30 lb-ft, differences 3.58 hp and 34.01 lb-ft. Both July 7, 2014 runs use SAE 1.05, original tune, downpipe and exhaust, 275/30-19 tires and fourth gear. Baseline at 2:26:15 pm versus intake at 2:41:57 pm has slightly different weather; intake explicitly says No Cover. These are qualified point and maximum comparisons, not independent proof for all chassis or the optional cover. No current linked flowchart establishes numeric flow improvement. Manufacturer/manual California restrictions apply. Turn14 authenticated access is unavailable and prices remain unchanged.
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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