aFe 51-76309 is the Momentum GT Pro DRY S intake for qualified F-chassis BMW B58 applications. It uses one three-layer oil-free synthetic filter, molded main housing with sight window, plastic intake tube and silicone double-hump coupling. The manufacturer excludes convertibles. Exact selected dry retailer descriptions identify a carbon-fiber trim overlay, rather than an all-carbon housing or tube.
Original ranges are retained: 340i and 340i xDrive Base 2016-2018; 440i, 440i Gran Coupe, 440i xDrive and 440i xDrive Gran Coupe Base 2017-2020; 740i Base 2016-2018 and 740i xDrive Base 2017-2018. Exact selected dry retailer tables positively include those 740i rows, although they are not named on the current manufacturer manual; confirm actual housing and mounting configuration. The manual explicitly includes non-convertible F22 M240i/ix through 2021, and exact selected dry named tables support M240i Base 2017-2021 and extension of original M240i xDrive Base through 2021. The manual also names F34 340i GT; an exact dry regional table lists 2016-2019, but a new US named-trim range remains held pending exact named-year confirmation. No US M140i, generic 2016 M240i, later G-chassis or convertible mapping is inferred.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2016-2018 | BMW | 340i | 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 |
| 2017-2018 | BMW | 740i xDrive | Base |
| 2017-2021 | BMW | M240i xDrive | Base |
| 2017-2021 | BMW | M240i | Base |
Verify 51-76309 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-76309 |
| Product line | Momentum GT cold air intake |
| Selected filter | One 21-91103 Pro DRY S; three oil-free synthetic layers |
| Filter dimensions qualification | Current replacement 3.5-inch flange, 5-inch base, 4.5-inch inverted top, 7.5-inch height; generic 8.75-inch oval overview conflicts |
| Materials | Molded main housing and plastic tube; exact retailer carbon-fiber trim overlay qualification |
| Body restriction | Convertible models excluded by manufacturer |
| Bench-flow qualification | Primary headline 28% conflicts with detail 13%; linked image actually labels oiled 54 version at 214 versus 167 CFM, 1.5 inches H2O |
| Other airflow rating | 400 CFM stated at 7 inches H2O; matching comparison at that pressure not reviewed |
| Dyno qualification | Filter media unspecified in linked run; marked differences 13.22 hp / 12.70 lb-ft at different rpm; maxima +7.49 hp / +4.26 lb-ft |
| Emissions | Not CARB exempt; manufacturer California purchase/use restriction applies |
| UPC | 802959542309 |
| 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 | 21-91103 | Selected Pro DRY S oil-free filter |
| 1 | 05-76309B2 | Molded housing with inspection window |
| 1 | 05-76309B4 | Molded intake tube |
| 2 | 03-50490 | M4 Torx sensor screws; length not stated |
| 2 | 03-50002 | No. 060 coupling clamps |
| 1 | 05-01417 | Silicone double-hump coupling |
| 1 | 03-50534 | Lower rubber housing mount |
The oiled element in the shared bill belongs to the other media version. The illustrated filter-flange clamp is separate from the two coupling clamps. The supplied rubber mount is distinct from the two original vehicle mounting grommets. Retain the original MAF and original housing mounting locations. The current exact bill shows a double-hump coupling without separately listed breather-line fittings; generic elbow/breather descriptions do not establish those extra components. No separate dynamic scoop, tuning module or replacement sensor is itemized. Exact selected-part carbon-fiber trim descriptions support the retained category tag, without establishing an all-carbon housing or tube.
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 21-91103 Pro DRY S filter with three oil-free synthetic layers. The replacement lists a 3.5-inch flange and 7.5-inch height; the generic oval 8.75-inch overview requires revision confirmation.
Does this fit convertible models?No. The manufacturer explicitly excludes convertibles because of the factory strut-brace arrangement.
Which M240i years are supported?The exact manual and selected-part named tables support F22 M240i and M240i xDrive 2017-2021, subject to the non-convertible restriction.
What about existing 740i applications?Exact selected-part retailer tables list them, but the reviewed manufacturer manual does not. Confirm the actual housing, mounts and connections before ordering.
How many housing mounts are used?One supplied lower rubber mount is installed in the housing; the two original vehicle grommets stay in their original locations.
Is the coupling a breather elbow?The exact bill lists the 05-01417 silicone double-hump coupling. It does not separately list the extra breather fittings suggested by generic overview wording.
Does the dyno certify dry peak-to-peak gains?It does not identify filter media. Its marked differences are 13.22 hp and 12.70 lb-ft at different rpm, while separate maxima differ by 7.49 hp and 4.26 lb-ft.
What torque, battery and recheck instructions apply?The exact manual requires checking clamps and connectors after 200 miles. It gives neither a numeric torque nor a battery-disconnection step.
Verify aFe 51-76309. Read all twelve pages and figures A-H. Work on a cool engine. Loosen the original housing-side tube clamp, disconnect the MAF and pull the original airbox from its mounts. Loosen the turbo-inlet connection and remove the original intake tube. Snap the selected filter into the new housing with its clamp loose, and install the supplied rubber mount into the small lower housing hole. Verify both original vehicle grommets remain seated, reinstalling them if needed. Push the housing onto its mounts. Transfer the original MAF with the supplied screws. Place the silicone coupling over the factory turbo inlet with clamps loose. Insert the tube into that coupling first and then the filter. Align all components before securing the clamps and reconnecting the MAF. Check clamps and connectors after 200 miles. The exact manual specifies neither battery disconnection nor numeric torque; procedures from a different kit are not substituted.
The exact current dry page, all twelve PDF pages, full bill, assembly diagram, figures A-H and actual flow/dyno images were inspected. Its 28-percent flow headline conflicts with the 13-percent detail claim, alongside 400 CFM at 7 inches H2O. The linked airflow image actually labels oiled 54-76309 at 214 versus stock 167 CFM, 1.5 inches H2O, approximately 28.1%; no separate selected dry curve verifies those claims. The linked 2016 340i dyno labels Momentum without filter-media identity, so it is not a separate dry certification. It marks 315.25 versus 302.03 hp and 303.16 versus 290.46 lb-ft at different engine speeds, differences of 13.22 hp and 12.70 lb-ft. Run maxima are 315.50 versus 308.01 hp and 313.39 versus 309.13 lb-ft, differences of 7.49 hp and 4.26 lb-ft. February 28 and March 13, 2017 runs use SAE 0.99 and 1.00, different weather, original exhaust and fourth gear; the intake run notes unquantified miles. These conditions do not certify every listed chassis. Current dry replacement-filter dimensions conflict with the generic overview and require actual revision confirmation. Exact selected dry retailer descriptions support carbon-fiber trim, without establishing an all-carbon structural assembly. Current manufacturer convertible and California restrictions apply.
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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