aFe 51-76402 is the Momentum GT Pro DRY S intake for qualified Audi A4 B8 2.0L turbo applications. One washable three-layer oil-free synthetic filter fits an enclosed XLPE housing with inspection window, molded plastic tube and integrated aluminum turbocharger heat-shield panel. The original MAF sensor is retained with a supplied extension harness.
The current manufacturer page and exact manual specify Audi A4 B8 2009-2016 with a 2.0L turbo engine; the manufacturer page additionally lists Audi A5 2.0L turbo 2008-2016. Existing named rows are preserved because exact-part retailer tables positively list them: A4 Base 2009-2014, Cabriolet 2009, Premium and Premium Plus 2015-2017, Prestige 2015 and separately 2017; A5 Cabriolet 2010-2014. The 2009 A4 Cabriolet and 2017 A4 entries require exact chassis, housing and sensor confirmation against the B8-specific manufacturer manual; retailer inclusion alone is not installation certification. The original Prestige 2016 gap is retained. Broader A5 manufacturer years do not establish additional named trims.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2009-2014 | Audi | A4 | Base |
| 2009 | Audi | A4 | Cabriolet |
| 2015-2017 | Audi | A4 | Premium |
| 2015-2017 | Audi | A4 | Premium Plus |
| 2015 | Audi | A4 | Prestige |
| 2017 | Audi | A4 | Prestige |
| 2010-2014 | Audi | A5 | Cabriolet |
Verify 51-76402 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-76402 |
| Product line | Momentum GT cold air intake |
| Selected filter | One 21-91113 Pro DRY S; three oil-free synthetic layers |
| Filter dimensions qualification | Replacement listing: 4-inch flange, 6-inch base, 4.5-inch inverted top, 7.5-inch height; overview says 7-inch height |
| Housing / tube / shield | Molded XLPE housing / molded plastic tube / aluminum turbo heat shield |
| Bench-flow qualification | Linked image actually labels oiled 54 version: 140 versus stock 94 CFM at 1.5 inches H2O; not selected dry certification |
| Power claim qualification | Manufacturer advertises up to 11 hp / 13 lb-ft; matching dyno chart not linked on the reviewed page |
| Emissions | Manufacturer references D-550-30 for some or all applications; exact vehicle coverage requires the full order |
| UPC | 802959541272 |
| 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 | 21-91113 | Selected Pro DRY S oil-free air filter |
| 1 | 05-76402B1 | Molded intake tube |
| 1 | 05-76402B2 | Housing assembly with integrated aluminum heat shield |
| 1 | 05-01421 | Silicone elbow coupling |
| 2 | 03-50019 | No. 044 coupling clamps |
| 1 | 05-70018 | MAF sensor extension harness |
| 1 | 03-50066 | T20 security bit |
The oiled filter in the shared bill is an alternative and is not supplied with the selected dry version. The illustrated filter-flange clamp is additional to the two coupling clamps. Retain the original MAF sensor and screws, two airbox mounting grommets, original front plastic cover and its screws, and engine cover. The heat shield arrives installed with threadlocker; check all four shield screws as instructed. No replacement MAF sensor, new sensor screws, tuning module or numerical torque specification is itemized. Although generic auxiliary-inlet and retailer plug wording appears in descriptions, the reviewed exact bill does not list a separate plug; confirm the actual assembly before assuming one is supplied.
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 21-91113 Pro DRY S filter with three oil-free synthetic layers. The oiled filter in the shared manual belongs to the other media version.
Is the intake tube aluminum?The manufacturer describes a molded plastic tube. The turbocharger heat-shield panel is aluminum.
Does it include a new MAF sensor?No. Transfer the original sensor with its original screws; the kit supplies a MAF extension harness and T20 security bit.
How must the elbow be aligned?Its angle points straight back toward the turbo. Use the small molding line as the manual alignment reference and seat the tube evenly.
How is the filter retained?Push it into the housing until all six tabs engage, then align the tube and secure the filter-flange connection.
Are all listed 2017 A4 applications certified?No. Exact retailer tables contain 2017 entries, while the reviewed manufacturer manual specifies B8 2009-2016. Confirm the actual chassis, housing and sensor arrangement before ordering.
Does the linked flow chart certify dry-filter gains?No. Although linked from the dry page, its actual label names the oiled 54 version at 140 versus stock 94 CFM at 1.5 inches H2O. It has no separate selected dry curve.
What tightening and follow-up checks apply?Check all four preinstalled shield screws and secure all connections. Recheck connections after 100-200 miles; no numeric torque is stated in the exact manual.
Verify aFe 51-76402. Read all twenty pages and figures A-L. Work on a cool engine and disconnect the negative battery terminal. Remove the front plastic cover, intake scoop and vented shroud, disconnect the MAF harness, and remove the original intake coupler. Aim the silicone elbow straight back toward the turbo using its molding line; secure the lower clamp while leaving the upper connection loose. Transfer both mounting grommets and check the four preinstalled heat-shield screws. Lower the housing into the frame-rail mounts. Press the filter into place until all six retention tabs engage, leaving its clamp loose. Transfer the original MAF sensor using the factory screws and supplied security bit. Insert the tube into the coupler first, then into the filter, keeping the coupling evenly seated. Reroute the MAF harness forward behind the other electrical connectors and connect the supplied extension at both ends. Secure the tube and filter clamps, restore the engine cover at all four mounts, and reinstall the original front plastic cover and screws. Recheck connections after 100-200 miles. The manual supplies no numeric tightening torque. Apply the supplied EO identification label as instructed only after confirming that the exact vehicle is covered by the applicable order.
The exact current dry manufacturer page, all twenty manual pages, full bill, assembly diagram and figures A-L were inspected. The manual is byte-identical to the current oiled manual and explicitly identifies the selected dry filter. The image linked as the dry airflow chart actually labels oiled 54-76402 at 140 versus stock 94 CFM, 1.5 inches H2O, approximately 48.9%; no separate selected dry curve is shown. That image does not certify the dry 48-percent claim. No matching dyno chart is linked on this page, so advertised 11 hp / 13 lb-ft gains remain manufacturer claims without an inspected selected dry run chart or peak-to-peak comparison. The current replacement-filter height differs from the generic overview; verify the actual service revision. Original exact dry retailer-positive 2009 Cabriolet and 2017 A4 rows remain qualified source conflicts against B8 2009-2016 manufacturer scope, rather than physical fit certification or a tested incompatibility assertion. Original Prestige 2016 gap is retained. D-550-30 is cited for some or all applications; prior scanned order evidence does not independently establish every exact dry year/engine exclusion here. Preserve actual vehicle-specific requirements and verify the order before relying on an exemption. Existing EO metadata is retained; no blanket 50-state approval is asserted.
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
Shop aFe POWER intake systems, replacement filters, exhaust components, BladeRunner cooling parts and CONTROL chassis accessories at Black Ops Auto Works. Compare Momentum GT, Track Series and Magnum FORCE intake applications alongside Pro DRY S and Pro 5R filter choices. Choose a complete upgrade or a service component for the system already on your car, truck or SUV.Choose Your aFe Intake and FilterMomentum GT, Track Series and Magnum FORCECompare the intake housing, tubing, filter arrangement and finish offered for your engine. The collection includes Momentum GT applications, selected carbon-fiber Track Series systems and Magnum FORCE configurations. Each package supplies its own combination of induction components, so choose the design for the installation you want.Pro DRY S or Pro 5R Filter MediaPro DRY S uses oil-free media and skips the re-oiling step during service. Pro 5R is an oiled filter option with a different maintenance procedure. Choose a media configuration aFe off...
View aFe Products
Shop performance air intake systems for your next engine-bay upgrade at Black Ops Auto Works. Compare complete cold-air intakes, short-ram layouts and enclosed systems from Legmaker, JLT, aFe, K&N, Injen and other listed manufacturers. Choose the intake character, packaging and filter-service approach that suit the vehicle and the way you use it.Complete Intakes or a Focused Component UpgradeA complete intake is the place to start when changing the filter, tubing and enclosure as a matched package. An individual airbox, intake tube, coupler or replacement filter can be a better purchase when the rest of the installed system is staying. Compare what the package supplies before choosing between the two routes.For a naturally aspirated, turbocharged or supercharged engine, the connection and sensor arrangement are part of the design. Choose the complete system for that application rather than combining a large tube and filter solely by appearance.Cold-Air, Short-Ram and Enclosed De...
View Air Intake Systems Products
Refresh your Audi A4 or plan its next upgrade with suspension, brake, drivetrain and wheel options at Black Ops Auto Works. Compare Bilstein dampers and suspension kits, Brembo replacement pads and Clutch Masters hardware alongside do88 intake and pressure hoses. Choose a maintenance job or a coordinated chassis project around your A4 generation, engine and body style.Suspension Choices for Your Driving GoalsChoose a replacement damper when the existing spring setup suits your plans, or compare an adjustable suspension kit when ride height is part of the project. Bilstein B16 and H&R coilover listings offer different application-specific approaches. Check the exact sedan or Avant, drivetrain and chassis coverage, including the additional clearance planning required by ultra-low tuner-fitment kits.Brakes and Manual-Drivetrain ServiceBrembo ceramic replacement pads provide a friction-service option for named A4 applications. Match the axle and installed caliper before planning the...
View Audi A4 Parts and Accessories Products
Give your Audi A5 a coordinated refresh with wheel, spacer and accessory options at Black Ops Auto Works. Compare APR A01 and A02 designs, plan the matching hardware and complete smaller lighting or wiper service jobs. Select your generation and body style before building a package for the way you use the car.Choose Your APR Wheel DesignExplore A01 and A02 wheel listings in different available diameters and finishes. A new design changes the look of the car, while width, offset and tire choice determine the overall package. Check the actual hub interface, load suitability and brake clearance alongside those dimensions.Spacers and Hardware for the Complete PackageH&R and APR spacer options allow a measured outward change in wheel position. Choose thickness after checking tire, body and suspension clearance, then match bolt thread, seat and required length to the assembly. Hub-centric rings serve a specific wheel-to-hub diameter relationship; select them from the actual measuremen...
View Audi A5 Parts and Accessories Products
Shop cold air intakes, short-ram systems, closed-airbox packages and intake tubes at Black Ops Auto Works. Compare Legmaker carbon-fiber layouts with aFe, K&N, Injen, AEM, JLT, CORSA, Volant and other listed options. Choose the filter location, inlet connection, service requirements and induction character that suit the vehicle and build.Choose the Intake LayoutA closed-airbox system encloses the filter and uses its specified air-feed arrangement. An open-element or short-ram layout places the filter differently and can change the audible induction character. A longer routed intake, a short-ram system and a factory-airbox tube replacement involve different installation scopes.Compare the actual filter position, heat-shield/enclosure design, retained ducts and access for maintenance. A cold-air label alone does not establish a lower inlet temperature in every driving condition or a fixed horsepower gain. Review manufacturer testing for the exact system and application.Legmaker HE...
View Cold Air Intakes Products
