aFe 54-10451 is the Magnum FORCE Stage-1 Pro 5R intake with one oiled filter, metal shield, aluminum cover and billet filter adaptor. The original MAF assembly and engine intake tube remain. Engine designation, emissions label and airbox arrangement matter: the linked sheet contains conflicting M56/SULEV application notes that must be resolved for the actual vehicle.
Current primary headline identifies E46 3-Series 2001-2006 2.5L/3.0L M54, while the selected manual identifies 330i 2001-2006 M54 3.0L, X3 2004-2006 M54 3.0L and 325i 2003-2006 M56 2.5L. That same sheet explicitly excludes 2003-2006 325i LEV2 SULEV test groups 3BMXV02.5M56, 4BMXV02.5M56, 5BMXV02.5M56 and 6BMXV02.5M56. Exact retailer listings also positively identify broader 325Ci/i/xi rows, so existing rows are retained as a source conflict, not a finding of physical incompatibility. Before ordering, match the actual engine, emissions label, MAF diameter and airbox connection and resolve the conflicting M56/SULEV instructions. The adjacent manual table for a different kit does not add its 323i, 328i or X3 2.5L applications here. Existing bounds and native memberships remain unchanged. Full D-550-38 conditions remain unverified.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2001-2006 | BMW | 325Ci | Base |
| 2001-2005 | BMW | 325i | Base |
| 2001-2005 | BMW | 325xi | Base |
| 2001-2006 | BMW | 330Ci | Base |
| 2001-2006 | BMW | 330i | Base |
| 2001-2006 | BMW | 330xi | Base |
| 2004-2006 | BMW | X3 | 3.0i |
Verify 54-10451 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 54-10451 |
| Product | Magnum FORCE Stage-1 cold air intake |
| Selected filter | One 24-91021 five-layer oiled Pro 5R |
| Filter dimensions | 5-1/2-inch flange, seven-inch base, 5-1/2-inch inverted top, six-inch height |
| Shield and cover | 18-gauge powder-coated metal shield; aluminum cover |
| Adaptor | Billet aluminum; original MAF O-ring reused |
| Engine intake tube | Original tube retained |
| Spring clips | Two supplied; hooked ends enter MAF slots |
| Button-head screws | Eight M6 x 1 x 10 total; no location split stated |
| Mounts | Original screws at A/B; supplied M6 nut and washer at C |
| Application qualification | M54/M56 headline and SULEV exclusion conflict; verify actual housing and engine label |
| Performance evidence | 20 hp / 27 lb-ft and 76% flow advertised; linked chart lacks stock/modified legend and complete conditions; no flow report |
| Emissions | D-550-38 cited; exact full conditions and exclusions unverified |
| Procedure limits | No battery step, numeric torque, recheck interval or mileage |
| UPC | 802959500910 |
| 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 | 24-91021 | Selected oiled Pro 5R filter |
| 1 | Housing | Metal heat shield |
| 1 | Aluminum cover | Separate top cover |
| 1 | Billet adaptor | Filter/retained-MAF interface |
| 8 | M6 x 1 x 10 | Button-head screws |
| 2 | Spring clips | Original MAF retention |
| 1 | M6 | Nut |
| 1 | M6 | Washer |
The shared dry filter reference is an alternative, not a second supplied filter. Retain the original MAF O-ring, engine intake tube, snorkel and the two original mounting screws. The primary coupler-included flag is not supported by a separate coupler in the exact bill or illustrated assembly; confirm actual kit revision rather than assuming an additional rubber connector. No new MAF sensor, replacement engine tube, new O-ring or edge-trim quantity is listed. The cover is in the bill and final image, although a separate cover-fastening step is omitted; follow the actual cover/hardware arrangement without assigning an unsupported screw split.
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 oiled filter, metal heat shield, aluminum cover, billet adaptor, eight button-head screws, two spring clips, one M6 nut and one M6 washer.
Does Stage-1 replace the engine intake tube?No replacement engine tube is in this bill. Retain the original tube and MAF assembly.
Is a separate rubber coupling supplied?The primary flag says a coupler is included, but the exact bill and assembly show no separate coupling. Confirm the actual kit revision before assuming one.
How is the MAF sealed and retained?Reuse its original O-ring in the billet adaptor groove and fit the two supplied spring clips into the MAF slots. Reconnect the original clamp and electrical plug.
Why does a 325i require extra verification?The selected manual lists M56 coverage but also excludes specified M56 LEV2 SULEV test groups, while current headline and exact retailers list broader M54 applications. Resolve the actual engine and housing conflict before ordering.
Are all eight button-head screws assigned to specific locations?The bill lists eight total and the procedure uses them at the adaptor. A separate cover-fastening step and screw split are not provided. Verify the actual cover arrangement.
Are the gains and emissions coverage fully verified?The linked chart lacks complete comparison conditions, no flow report is linked, and full D-550-38 conditions remain unverified.
What final checks or recheck interval are stated?Secure hoses, clamps and electrical connections and confirm the filter and cover assembly. No battery step, numeric torque or recheck/mileage interval is stated.
Verify aFe 54-10451. Read the complete fifteen-image sheet and its application exclusions. Remove the two original airbox screws with 10mm tooling, unplug the MAF and loosen its hose clamp with 1/4-inch tooling. Lift the stock airbox out and remove the rubber cushion at the bottom of the fenderwell. Separate the original MAF and carefully save its O-ring. Attach the billet adaptor to the shield with the supplied button-head hardware and place the original O-ring in the adaptor groove. Refit the MAF, tighten its retained clamp and reconnect the electrical plug. Hook the two supplied spring clips into the MAF slots. Attach the original snorkel to the shield, position the assembly, seat the MAF and engage the clips. Reuse original mounting screws A/B and fit the supplied M6 washer and nut at C. Install the selected filter and tighten its clamp. Fit the included aluminum cover to the actual mounting arrangement; the final illustration shows it installed but the numbered text omits a separate fastening step. Confirm hoses, clamps and electrical connections are secure. Apply an EO label only for the exact covered application and conditions. No battery step, numeric torque, periodic check, recheck interval or mileage is stated.
The exact primary, complete one-page manual, all fifteen images, bill and actual linked dyno chart were reviewed. M56 coverage in the selected table directly conflicts with its explicit LEV2 SULEV test-group exclusion and with broader M54 retailer coverage. Existing positive rows and bounds are retained with this qualification; another engine or kit table is not used to infer fit. The bill includes a cover and eight button-head screws but does not specify their location split, and lists no separate coupling despite the primary flag. The linked dyno identifies a 2001 BMW 330Ci and dated 2003 test/print information, but lacks a stock/modified legend, complete numerical run table, configuration and correction/weather conditions. Advertised 20 hp and 27 lb-ft are not independently established, and no linked flow report verifies 76%. Current primary cites D-550-38; the indexed official table identifies the selected X3 3.0i application, while full order conditions and exclusions remain unverified. Confirm actual application and emissions requirements before purchase.
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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