aFe 51-12912-B is the black-cover Magnum FORCE Stage-2 Pro DRY S intake for qualified BMW B58 3.0L turbo applications. One selected-media filter fits an vacuum-formed plastic cover, which attaches to the retained original lower airbox. The exact shared manufacturer manual expressly names this selected kit, identifies the current B4 tube and excludes convertible models. Original 740i and restored 740i xDrive applications are separately qualified by exact selected-part retailer evidence.
The exact manufacturer manual lists 340i/ix/GT F30/F31/F34 2016-2019, 440i/ix/Gran Coupe F32/F36 2016-2020 and M140i/M240i F20/F21/F22 2016-2021 with the B58 3.0L turbo, expressly excluding convertibles. All ten original Base rows, shorter ranges and compressed tags are preserved. Exact selected-part retailer tables support extending M240i xDrive through 2021 and restoring 740i xDrive Base 2017-2018; the original 740i 2016-2018 row is retained with the same retailer qualification because the current shared manual does not name the 7 Series. Existing model-level Base mappings are conditional on a non-convertible body and matching actual airbox, inlet, MAF and brace clearance. Positive convertible retailer rows conflict with the express manufacturer exclusion and do not create convertible fitment. Non-US M140i/early M240i or 440i years, retailer N55 labeling and later G-series or hybrid housing arrangements remain held without new selections. No 2019 340i sedan extension is inferred from the combined GT manual heading.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2016-2018 | BMW | 340i | Base |
| 2017-2019 | BMW | 340i GT xDrive | Base |
| 2016-2018 | BMW | 340i xDrive | Base |
| 2017-2020 | BMW | 440i | Base |
| 2017-2020 | BMW | 440i Gran Coupe | Base |
| 2017-2020 | BMW | 440i xDrive | Base |
| 2017-2020 | BMW | 440i xDrive Gran Coupe | Base |
| 2016-2018 | BMW | 740i | Base |
| 2017-2021 | BMW | M240i | Base |
| 2017-2021 | BMW | M240i xDrive | Base |
| 2017-2018 | BMW | 740i xDrive | Base |
Verify 51-12912-B against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-12912-B |
| Series/configuration | Magnum FORCE Stage-2; black upper cover |
| Media/quantity | One Pro DRY S three-layer oil-free synthetic filter |
| Filter identity | 21-90096; seven-inch height per selected-part secondary description |
| Cover | 05-12912B2; black vacuum-formed plastic |
| Current intake tube | 05-76309B4; final installed photograph expressly shows older tube revision |
| Coupling/clamps | 05-01417 double-hump silicone coupling; two #060 clamps |
| MAF | Original sensor transferred with two M4 Torx screws; exact bill gives no length |
| Retained factory components | Original lower airbox, original clips and MAF sensor |
| Body restriction | Exact manual excludes convertible models |
| 740i application qualification | Original 740i 2016-2018 and restored 740i xDrive 2017-2018 supported by exact selected-part retailers; not named in current manual |
| Performance evidence | Exact primary flow/dyno charts not located; secondary 11% and media-dependent power claims held without certification |
| Emissions | Exact manual prohibits use on any California DMV-registered on-road or off-road vehicle |
| Post-install instructions | Verify all clamps and bolts secure; no numeric torque or mileage interval supplied |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 21-90096 | Pro DRY S air filter |
| 1 | 05-12912B2 | Selected black upper cover |
| 1 | 05-76309B4 | Current intake tube; do not identify it from older installed-tube photo |
| 1 | 05-01387 | Silicone auxiliary-opening plug |
| 1 | 05-01417 | Double-hump silicone coupling |
| 2 | 03-50002 | #060 clamp |
| 2 | 03-50490 | M4 Torx screw; no length in exact bill |
Black and carbon-fiber-look covers and oiled/dry filters are alternatives in the shared bill; only one selected cover and one selected filter are supplied. Retain the original lower airbox, clips and MAF. No new MAF, complete lower housing, wiring or additional sensor hardware beyond the two M4 screws is itemized. The current bill identifies B4 tube while Figure D explicitly shows an old revision; do not replace the current bill with a photo-derived part number. Exact-part secondary descriptions say seven-inch filter height, while shared service-element references elsewhere give 6.5 inches; confirm the actual element dimensions before replacement.
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 21-90096 Pro DRY S filter with three-layer oil-free synthetic media. The other media entry in the shared manual is an alternative.
Which cover is supplied?One black vacuum-formed plastic upper cover, 05-12912B2. It is the selected alternative in the shared bill.
Are two covers supplied?No. Black and carbon-fiber-look covers are alternative configurations, just as dry and oiled filters are alternative media.
Does the original lower airbox remain?Yes. The new upper cover attaches to the original lower airbox with the original clips.
Which tube and sensor arrangement does the exact bill identify?Current tube 05-76309B4 transfers the original MAF with two supplied M4 screws, with no specified length. Figure D expressly shows an older tube revision. No new MAF is supplied.
What is the correct tube installation order?Seat the tube in the filter first, then in the double-hump coupling at the turbo-inlet tube. Align it, tighten coupling clamps and then the filter clamp.
Do these applications include convertibles?No. The exact manual expressly excludes convertible models. Original model-level Base mappings are conditional on the non-convertible body and matching inlet and brace arrangement.
How are 740i coverage and performance figures qualified?Exact selected-part retailers support original 740i 2016-2018 and restored 740i xDrive 2017-2018; the shared manual does not name the 7 Series. No primary flow/dyno chart certifies secondary numeric gains. Verify secure clamps and bolts; the exact procedure provides no battery step, torque or mileage interval. Retain its California restriction.
Verify aFe 51-12912-B. Read the entire eight-page manual, work on a cool engine and retain factory parts. Unplug the MAF harness, release the original upper-airbox clips, loosen the tube-to-turbo-inlet clamp and remove the original upper airbox and tube. Preinstall the selected filter with its clamp through the new cover, ensuring the filter retention groove snaps fully along the cover opening. Secure the new cover to the retained lower factory airbox with the original clips. Fit the double-hump coupling with both clamps on the original turbo-inlet tube, leaving the clamps loose. Transfer the original MAF into the current B4 tube with the supplied M4 screws. Insert the tube into the filter first, then into the coupling. Align the assembly, tighten coupling clamps and then the filter clamp, reconnect the MAF harness and verify every clamp and bolt is secure. The exact manual supplies no battery-disconnection step, radiator-cover-removal step, numeric torque or mileage interval. Figure D shows an older tube revision; use the current bill and actual supplied tube. No cutting or drilling is described.
Current standalone manufacturer product page was not located. The publicly indexed exact eight-page shared manufacturer manual expressly names this black dry kit; its full text, both contact sheets, bill and Figures A-D were read and visually inspected. It is the same source already inspected for the carbon-look configurations, with a separately selected black cover. Current B4 tube and 05-01417 coupling are not borrowed from a four-cylinder kit. Exact selected-product retailers support media, 740i xDrive and M240i xDrive endpoints. The manufacturer expressly excludes convertibles, and conflicting positive retailer convertible rows remain held. No exact primary flow/dyno chart was located, so secondary 11% flow and varying output figures are not certified. No battery step, radiator-cover removal, numeric torque or mileage recheck is borrowed. Turn14 exact-product data remains unavailable without authenticated access. Protected commercial data and price are 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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