aFe 50-40045D is the Momentum ST intake for BMW X5M F85 2015-2018 and X6M F86 2015-2019 with the S63 4.4L twin-turbo V8. It uses two selected Pro DRY S filters, one integrated-scoop XLPE housing and two side-specific XLPE tubes. The current manufacturer-linked manual shows a six-tab filter interface, three housing mounts and two tube mounts. Its bill and factory-tube procedure differ from older clamp/coupling descriptions, so match the actual boxed revision to the exact instructions.
Exact current manufacturer pages and the shared 12-page manual agree on X5M F85 2015-2018 and X6M F86 2015-2019, both S63 4.4L twin-turbo. Preserve the original two X5 M and X6 M rows with their separate endpoints and all existing model-level memberships. These are genuine M models; ordinary X5/X6 4.4L engines and later F95/F96 platforms are not approved by displacement alone. Some retailer combined lists extend X5M to 2019; that conflicts with the exact F85 2018 manufacturer endpoint and is held without extension. Match the actual housing/filter-tab revision and original tube/MAF arrangement before fitting.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2015-2018 | BMW | X5 | M |
| 2015-2019 | BMW | X6 | M |
Verify 50-40045D against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 50-40045D |
| Product line | Momentum ST |
| Application | X5M F85 2015-2018; X6M F86 2015-2019; S63 4.4L twin-turbo |
| Selected filters | Two 21-90109 Pro DRY S; three synthetic oil-free layers |
| Filter dimensions | Each: 5 x 2-1/4-inch oval flange; 6-1/4 x 3-3/4-inch base; 5-1/4 x 2-1/4-inch top; 11-inch height |
| Current service pair | 21-90109-MA; pair packaging reference, not two additional filters |
| Housing | One 05-5040045B3 XLPE housing with integrated scoop |
| Tubes | 05-5040045B1 driver; 05-5040045B2 passenger; XLPE |
| Rubber mounts | Three housing 03-50534; two tube 03-50620 |
| Sensor screws | Four M4 Torx 03-50490; length/pitch unstated |
| Filter retention | Current sheet: press-fit interface with six seating tabs |
| Clamps/coupling qualification | Primary generic clamps/coupler wording conflicts with current bill omitting separate clamps/couplings and reusing factory tubes |
| Battery/recheck | Negative terminal disconnected; check bolts, clamps, connectors at 100-200 miles |
| Torque | No numeric torque in exact manual |
| Emissions | Not CARB exempt; manufacturer California purchase/use restriction applies |
| Bench-flow comparison | 865 versus stock 680 CFM at 7 inches H2O, a calculated 27.21% increase |
| Dyno qualification | Marked point differences and run-maxima differences are distinct; original exhaust and fifth gear in both runs |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 2 | 21-90109 | Selected Pro DRY S filters |
| 1 | 05-5040045B1 | Driver-side intake tube |
| 1 | 05-5040045B2 | Passenger-side intake tube |
| 1 | 05-5040045B3 | Integrated-scoop housing |
| 3 | 03-50534 | Rubber housing mounts |
| 2 | 03-50620 | Rubber tube mounts |
| 4 | 03-50490 | M4 Torx screws; length/pitch unstated |
The exact current bill lists the selected filter pair as an alternative to the other medium, not four supplied filters. Matching-media -MA replacement references are service pairs. Original MAF sensors and factory intake tubes are retained. No new sensor, separate cover fasteners, stand-alone silicone coupling or separately counted clamps appear in the current illustrated bill. Generic current product wording still says coupler/clamps included; older installation revisions show a different interface. Confirm boxed revision and its complete parts list rather than adding older-revision hardware to this bill.
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
Two selected Pro DRY S filters, one integrated-scoop housing, two side-specific tubes, three housing mounts, two tube mounts and four M4 Torx sensor screws in the current linked bill.
Which X5M and X6M years apply?X5M F85 2015-2018 and X6M F86 2015-2019, both S63 4.4L twin-turbo. Ordinary X5/X6 engines and later platforms are not inferred.
Why do some descriptions mention extra clamps or couplings?Current generic page wording and older instructions differ from the downloaded current bill. The current procedure retains factory tubes and uses a six-tab filter interface. Match the actual boxed revision and its manual.
How are the filters retained?Press the filters into the housing until all six tabs seat, then gently pull to check retention. Do not substitute an older clamp-interface procedure.
Can the MAF sensors change sides?No. Transfer the driver sensor to the driver tube and passenger sensor to the passenger tube using the supplied M4 screws. No replacement sensors are included.
Which end of the new tube goes in first?The factory intake-tube connection first, then the filter. This is the sequence in the current exact manual.
Do headline power gains equal differences between maxima?At the marked 4626 rpm point, 458.6 versus 442.4 hp and 520.6 versus 502.3 lb-ft give 16.2 hp and 18.3 lb-ft differences. Maxima are 519.4 versus 515.4 hp and 548.9 versus 536.1 lb-ft, differences of 4.0 hp and 12.8 lb-ft. The selected run explicitly identifies PDS dry media.
What battery, torque and follow-up instructions apply?Disconnect the negative battery terminal before work. No numeric torque is given; check bolts, clamps and connectors after 100-200 miles.
Verify aFe 50-40045D. Read all twelve pages and figures A-G, work with a cool engine, disconnect the negative battery terminal and retain factory parts. Lift the top corners of the original front fresh-air duct to release its grommets and remove it. Disconnect both MAF harnesses, loosen the original tube clamps and remove the factory airbox while keeping the factory intake tubes. Install the three supplied housing grommets in the new housing. Slide its front tabs into the radiator support before pressing its rear onto the mounting peg. Press both filters into the housing until all six tabs seat, then gently pull-check retention. Put the two supplied tube mounts on the driver/passenger factory mounting pegs. Transfer each original MAF to its matching side-specific new tube using the four supplied M4 screws. Insert each new tube into the factory intake tube first, then into its filter. Align the tubes/filters, tighten the clamps and reconnect both MAF harnesses. Verify every connection and check bolts, clamps and connectors after 100-200 miles. The current manual gives no numeric torque and does not direct restoration of the removed front duct; the new housing has its own integrated scoop.
Both exact current manufacturer pages, their identical linked 12-page manuals, all bill/installation figures and actual selected-media flow/dyno reports were reviewed. The downloaded current manual differs materially from older publicly indexed installation sheets: its bill shows housing/tube rubber mounts and six filter seating tabs, with factory tubes retained, rather than separately itemized coupling/clamp hardware. Current page generic included-clamps/coupler wording remains a revision conflict. No hidden extra hardware or older torque is inferred. Original two application bounds and all native model memberships remain unchanged; retailer X5M 2019 extension stays held. Selected bench flow is 865 versus stock 680 CFM at 7 inches H2O, a calculated 27.21% increase. At the marked 4626 rpm point, 458.6 versus 442.4 hp and 520.6 versus 502.3 lb-ft give 16.2 hp and 18.3 lb-ft differences. Maxima are 519.4 versus 515.4 hp and 548.9 versus 536.1 lb-ft, differences of 4.0 hp and 12.8 lb-ft. The selected run explicitly identifies PDS dry media. Both dyno reports identify a 2017 X6M 4.4L twin-turbo, original exhaust, fifth gear, blade fan and SAE correction with smoothing 5. Baseline is 3:30:11 PM September 19, 2018; selected intake run is 10:48:20 AM September 20, 2018. Weather and numerical correction factors are not printed, and differing test dates limit generalization. Rounded headline gains are point claims, not differences between maxima. This product is not CARB exempt and the manufacturer California restriction applies.
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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