aFe 54-81012-C is the Magnum FORCE Stage-2 Si Pro 5R intake with a carbon-fiber-look ABS plastic cover for qualified BMW N52 naturally aspirated 3.0L applications. One 24-91054 filter uses five pre-oiled cotton-gauze layers. The molded tube, housing and dual kidney-style auxiliary inlets retain the factory MAF and air-duct connection. The current manual explicitly accommodates active or non-active steering layouts and identifies the excluded N51/SULEV engine test groups.
The current manufacturer identifies N52 128i E82/E88 2008-2013 and E9x 3-Series 2006-2013. The exact manual lists 2006 325i, 2006 330i, 2007-2013 328i and 2008-2013 128i, with the named xi/xDrive records below retained from exact selected-part sources. Verify actual N52 engine and chassis; shared model names also occur with excluded engines. Both exact product retailer tables contain positive 330Ci, 335d, 335i xDrive and 335is entries, but these conflict with the manufacturer N52 naturally aspirated specification and the M54, diesel or turbocharged engine/chassis evidence. Those four named groups per product are withheld pending exact manufacturer reconciliation, not represented as a physical installation test. No new 335i row is added. For 328i, the manual expressly excludes engine test groups 7BMXV03.0N51, 8BMXV03.0N51, 9BMXV03.0N51, ABMXV03.051R, BBMXV03.051R, CBMXV03.0N51R and DBMXV03.051R; the 128i exclusion list uses the same groups from 8BMXV03.0N51 onward. Match the exact emissions label rather than inventing an engine-based trim.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2008-2013 | BMW | 128i | Base |
| 2006 | BMW | 325i | Base |
| 2006 | BMW | 325xi | Base |
| 2007-2013 | BMW | 328i | Base |
| 2009-2013 | BMW | 328i xDrive | Base |
| 2007-2008 | BMW | 328xi | Base |
| 2006 | BMW | 330i | Base |
| 2006 | BMW | 330xi | Base |
Verify 54-81012-C against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 54-81012-C |
| Selected filter | 24-91054; five pre-oiled cotton-gauze layers; 5-inch height / 6-inch flange |
| Tube / housing | 05-81012B5 / 05-81012B2; molded plastic |
| Selected cover | 05-81012C3; carbon-fiber-look ABS plastic |
| Bellows | 05-01542; 3.1-inch ID x 3-inch length |
| Coupling clamps | Two #048 03-50007; separate filter-flange clamp |
| CCV alternatives | 03-50191 brass 1/8-NPT fitting or 03-50410 brass 1/8-NPT plug |
| Fasteners | Two M4, four M6 hex and seven 5/16-inch button-head screws; lengths not specified |
| Washers / grommets | Two M6 lock, four M6 flat washers and two supplied grommets |
| Battery / torque / recheck | No battery step or numeric torque in exact manual; inspect after 100-200 miles |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 24-91054 | Selected Pro 5R filter |
| 1 | 05-81012B5 | Intake tube |
| 1 | 05-81012B2 | Housing |
| 1 | 05-81012C3 | Selected carbon-fiber-look ABS plastic cover |
| 1 | 05-01542 | Silicone bellows |
| 2 | 03-50007 | SAE #048 coupling clamps |
| 1 | 03-50191 | Brass 1/8-NPT CCV fitting |
| 1 | 03-50410 | Brass 1/8-NPT closure plug |
| 2 | 03-50490 | M4 screws; no stated length |
| 2 | 03-50071 | M6 lock washers |
| 4 | 03-50070 | M6 flat washers |
| 4 | 03-50052 | M6 hex screws; no stated length |
| 2 | 03-50033 | Housing grommets |
| 7 | 03-50259 | 5/16-inch button-head cover screws; no stated length |
The dry filter and other cover rows in the shared bill are alternatives; only the selected oiled filter and selected cover are supplied. Both cover finishes are vacuum-formed ABS; the patterned appearance does not establish a structural carbon-fiber cover. Retain the factory dome grommet beneath the airbox. The two supplied housing grommets are separate from that original dome grommet. Retain the original steering-reservoir nuts and air-line routing. The threaded CCV fitting or plug has a normal small gap at its hex; do not force it flush. No new MAF, steering pump, reservoir or CCV hose is itemized.
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 24-91054 Pro 5R element with five oiled cotton-gauze layers. The current replacement specification gives 5-inch height and 6-inch flange.
What is the cover material?The selected cover is carbon-fiber-look ABS plastic. A carbon-fiber-look finish is an ABS appearance option.
Can N51/SULEV coverage be inferred from the 328i name?No. The exact manual excludes listed N51/SULEV engine test groups. Compare the actual emissions label.
What happens to the steering reservoir?Move it for access where required, then restore it with its two original nuts and reseat the air line on its bracket.
Which grommets are retained or supplied?Retain the original dome grommet under the housing. Two separate new housing grommets are supplied.
Should the NPT fitting be forced flush?No. The exact manual identifies a normal small gap between the threaded fitting hex and tube. Use the fitting or plug appropriate to the actual CCV connection.
Do mixed 335d/335is retailer rows establish fitment?No. They conflict with the manufacturer N52 naturally aspirated specification. The affected named groups are held pending exact reconciliation rather than certified from the mixed table.
What torque, battery and inspection instructions apply?The exact manual gives no battery-disconnection step or numeric torque. Check bolts, clamps and connectors after 100-200 miles.
Verify aFe 54-81012-C. Read all sixteen pages and figures A-I on a cool engine. Save the two original airbox bolts, unplug MAF, release the airbox clamp and original air duct, then lift out the original airbox without losing the dome grommet. If the steering reservoir sits above the intake tube, save its two nuts, release the air line from its bracket and move the reservoir for access as illustrated. Loosen the throttle-body clamp, release any original CCV hose and remove the tube. Transfer MAF with the supplied M4 screws. Fit the 1/8-NPT CCV fitting on vehicles with that hose, or the NPT plug where absent; a small hex-to-tube gap is normal. Seat the bellows internal bead in the throttle-body groove, check it can rotate when seated, and tighten the throttle-side clamp at the external locating bead; leave the other clamp loose. Move the reservoir for clearance without fastening it yet. Fit the two supplied housing grommets, seat the housing over the original dome grommet, reconnect the air duct and secure the housing with two M6 screws and flat washers. Pass the tube through the housing top and into the bellows. Reconnect CCV where fitted and MAF. Secure the tube with the remaining two M6 screws, flat washers and lock washers, then secure the bellows clamp. Install the selected filter and flange clamp. Restore the reservoir using its two original nuts and reseat the air line on its bracket. Secure the selected cover with all seven button-head screws. No battery-disconnection step or numeric torque is given. Check bolts, clamps and connectors after 100-200 miles.
The current manufacturer cites CARB EO D-550-38 for some or all applications. The exact complete EO table was not freshly accessible, so this is not blanket 50-state certification. Follow the manual emissions-test-group exclusions and the requirement to place the enclosed EO identification label on a clean, smooth surface on or near the intake when applicable. The airflow chart linked from this selected page actually labels the black-cover version: 241 versus 154 CFM at 1.5 inches of water, approximately 56.5% more. It is a manufacturer-linked shared hardware comparison, not an independently labeled patterned-cover test. Both linked dyno sheets show the same July 26, 2011 printed Mustang-dyno comparison, with intake acquisition July 26 versus April 29 baseline, original exhaust and third gear. The table maxima are 162 versus 154 hp and 155 versus 146 lb-ft, differences of 8 hp and 9 lb-ft. The advertised 12 hp and 16 lb-ft maximum-point gains are separate claims; no corresponding point markers, full correction/weather legend or independent model year are printed. The run comment contains a legacy six-inch inverted-filter description, which does not override the current five-inch filter-height specification. Conditions and revisions limit comparison.
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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