aFe 51-76305 is the Momentum Pro DRY S dual-filter intake for qualified BMW S55 applications. It supplies two three-layer oil-free synthetic filters, two molded housings, two plastic tubes and a real carbon-fiber driver-tube accent cover. Both original MAF sensors and the original carbon strut brace are retained.
BMW S55 twin-turbo only: existing M2 Competition 2019-2021, M3 Base 2015-2018, M4 Base 2015-2020, M4 CS 2019-2020 and M4 GTS 2016 rows remain unchanged. Exact selected-part retailer tables additionally support M3 CS 2018, consistent with BMW USA launch evidence. Some global retailer tables list M4 CS 2018; that earlier regional year is held rather than extending the existing US model-year row. No ordinary N55 M2 or later S58 chassis is inferred. Current page includes M2 Competition through 2021; the older manual cover lists M2 2019 only. This documented revision difference does not remove current manufacturer coverage.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2019-2021 | BMW | M2 | Competition |
| 2015-2018 | BMW | M3 | Base |
| 2015-2020 | BMW | M4 | Base |
| 2019-2020 | BMW | M4 | CS |
| 2016 | BMW | M4 | GTS |
| 2018 | BMW | M3 | CS |
Verify 51-76305 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-76305 |
| Product line | Momentum |
| Selected filters | Two 21-91097 Pro DRY S; three oil-free synthetic layers each |
| Filter dimensions qualification | Current service listing 3.5-inch flange, 5-inch base, 4.5-inch inverted top and 6.5-inch height; generic overview 5-inch height conflicts |
| Housing and tube materials | Molded housings and plastic tubes; carbon fiber accent cover |
| Selected dry flow | 705 versus stock 580 CFM at 7 inches H2O; approximately 21.55% |
| Dyno qualification | Linked image identifies oiled 54 version; maxima +8.12 hp / +12.64 lb-ft, not separate dry gain certification |
| Emissions | Manufacturer California restriction; no certified CARB exemption |
| UPC | 802959541159 |
| 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 |
|---|---|---|
| 2 | 21-91097 | Selected Pro DRY S oil-free filters |
| 2 | 03-50007 | Passenger elbow clamps |
| 4 | 03-50221 | M4 x 0.7 x 10 MAF screws |
| 2 | 05-01225 | Urethane auxiliary-opening plugs |
| 1 | 05-01334 | Passenger-side silicone elbow |
| 1 | 05-76305B1 | Driver-side tube |
| 1 | 05-76305B2 | Passenger-side tube |
| 1 | 05-76305B3 | Driver-side housing |
| 1 | 05-76305B4 | Passenger-side housing |
| 1 | 03-50033 | Vacuum-fitting grommet |
| 1 | 05-01246 | Vacuum fitting |
| 1 | 05-76305C5 | Real carbon fiber driver-tube cover |
| 4 | 03-50409 | M4 x 0.7 x 6 cover screws |
Also includes one 03-50033 grommet, one 05-01246 vacuum fitting, one 05-76305C5 carbon fiber cover and four 03-50409 M4 x 0.7 x 6 cover screws. Oiled filters in the shared bill belong to the other media version. Retain original MAF sensors, original lower mounting grommets, original carbon strut brace and fasteners. The kit is not a pair of full-carbon housings or full-carbon tubes.
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 21-91097 Pro DRY S filters, each with three oil-free synthetic layers. Current service dimensions list 3.5-inch flange and 6.5-inch height, unlike the generic five-inch overview.
Which parts are carbon fiber?The separate driver-tube accent cover is real carbon fiber; both housings and both tubes are molded components.
Is 2018 M3 CS coverage supported?Exact selected dry retailer tables support the 2018 M3 CS, consistent with BMW USA launch evidence. Earlier regional M4 CS labels remain qualified and do not extend the existing US row.
Do the original MAF sensors transfer?Yes. Transfer both original sensors with four supplied M4 screws. The MAF screws are M4 x 0.7 x 10; the four shorter cover screws are different.
How is the coolant hose retained?Place it on the driver tube and install the carbon accent cover over both tube and hose using four M4 x 0.7 x 6 screws.
Does the original strut brace remain?Yes. Remove and restore the original carbon strut brace, its eight bolts and reservoir bolt. Check that the hood cable is not pinched.
Are the dyno values selected dry peak gains?The linked chart identifies the oiled 54 version. Its larger marked point values also differ from its maxima, which differ by 8.12 hp and 12.64 lb-ft; it is not a separate dry certification.
What torque and follow-up checks apply?The exact manual supplies no numeric torque and calls for retightening connections after approximately 100-200 miles.
Verify aFe 51-76305. Read all sixteen pages and figures A-I. Work on a cool engine and disconnect the negative battery terminal. Remove each windshield cover push clip and three plastic 10 mm nuts. Remove eight strut-brace bolts and the additional 10 mm reservoir bolt, then lift out the original carbon brace. Disconnect driver-side MAF and vacuum connections, unclip the coolant hose, loosen the turbo clamp and unclip the front mount; remove the small original rubber gasket from the front bracket. Disconnect the passenger MAF, remove its airbox and original elbow. Snap both filters into their new housings and leave clamps loose. Seat the driver housing on original grommets. Transfer the passenger bottom grommet with its orientation matching the sheet metal, then seat that housing on its mounts. Transfer both MAF sensors using the four supplied M4 screws. Install the new grommet and aluminum vacuum fitting in the driver tube. Insert the driver tube into the original turbo inlet first, then the filter; secure its front bracket and align clamps. Restore vacuum and MAF connections. Position the coolant hose on the tube and install the carbon cover over both tube and hose using four M4 x 0.7 x 6 button-head screws. Fit the passenger silicone elbow to the turbo inlet with both clamps loose; insert its tube into the smaller coupling first, then the filter, align and secure clamps, and reconnect MAF. Restore the original strut brace and all fasteners without pinching the hood cable, then restore windshield covers and clips. The two optional plugs close auxiliary housing inlets to reduce warm-air entry and intake sound. The manual states no numeric torque. Retighten connections after approximately 100-200 miles.
The exact current dry page, all sixteen manual pages, full bill, assembly diagram, figures A-I and actual flow/dyno images were inspected. The flow chart separately identifies selected dry 705 CFM, oiled 770 CFM and stock 580 CFM at 7 inches H2O; selected dry improvement is approximately 21.55 percent, consistent with the rounded 22-percent claim. Although linked from the dry page, the dyno actually identifies the oiled standard 54 intake on a 2015 M4 F82, so it is not a separate dry-filter gain certification. It marks 348.80 versus 331.94 hp and 399.11 versus 379.80 lb-ft at different rpm, differences of 16.86 hp and 19.31 lb-ft. Separate maxima 410.89 versus 402.77 hp and 412.78 versus 400.14 lb-ft differ by 8.12 hp and 12.64 lb-ft. December 19, 2014 runs differ in time, weather and SAE factor: baseline 0.99 versus intake 1.00. Both note fifth gear, Sport+, original wheels and closed hood; original exhaust is explicit only for the intake run. The current service-filter height differs from the generic overview; confirm actual revision. Exact selected dry retailer evidence supports M3 CS 2018; earlier regional M4 CS 2018 labels do not extend the existing US 2019-2020 row. Current manufacturer California purchase/use 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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