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aFe 51-46405 is the Momentum ST oil-free intake for qualified Volkswagen Atlas 2018-2023 and Atlas Cross Sport 2020-2023 3.6L V6 applications. One dry filter, two molded tube sections and molded housing retain the original MAF cartridge and sensor. The factory cartridge is required and is not included.
Own exact twenty-page manual explicitly identifies Atlas 2018-2023 and Atlas Cross Sport 2020-2023, V6 3.6L. Current primary headline names Atlas; the manual supplies direct Cross Sport proof. Exact selected dry retailer indexed tables support nine missing named groups and five existing range extensions shown below. All original coverage, including Comfortline and Trendline 2020, is preserved. Later Canadian Execline/Highline rows seen in another exact retailer listing remain outside this verified expansion pending configuration reconciliation. No 2.0L or 2024-up engine inference is made.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2018 | Volkswagen | Atlas | Launch Edition |
| 2018-2020 | Volkswagen | Atlas | S |
| 2018-2023 | Volkswagen | Atlas | SE |
| 2018-2023 | Volkswagen | Atlas | SEL |
| 2018-2021 | Volkswagen | Atlas | SEL Premium |
| 2020 | Volkswagen | Atlas Cross Sport | Comfortline |
| 2020 | Volkswagen | Atlas Cross Sport | S |
| 2020-2023 | Volkswagen | Atlas Cross Sport | SE |
| 2020-2023 | Volkswagen | Atlas Cross Sport | SEL |
| 2020-2021 | Volkswagen | Atlas Cross Sport | SEL Premium |
| 2020 | Volkswagen | Atlas Cross Sport | Trendline |
| 2019-2022 | Volkswagen | Atlas | SEL R-Line |
| 2019 | Volkswagen | Atlas | SE R-Line |
| 2021-2023 | Volkswagen | Atlas | SEL Premium R-Line |
| 2023 | Volkswagen | Atlas | SEL R-Line Black |
| 2020-2022 | Volkswagen | Atlas Cross Sport | SEL R-Line |
| 2020-2023 | Volkswagen | Atlas Cross Sport | SEL Premium R-Line |
| 2020 | Volkswagen | Atlas Cross Sport | Execline |
| 2020-2021 | Volkswagen | Atlas Cross Sport | SE R-Line |
| 2023 | Volkswagen | Atlas Cross Sport | SEL R-Line Black |
Verify 51-46405 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-46405 |
| Product line | Momentum ST; current selected product and manual |
| Selected filter | One 21-91108 Pro DRY S; three oil-free synthetic layers |
| Filter dimensions | 4-inch flange, 6-inch base, 5.5-inch inverted top, 7.5-inch height |
| Tube sections | 05-46405B1 and 05-46405B2; molded |
| Housing | 05-46405B3; black cross-linked polyethylene per primary |
| Coupling | 05-01480 silicone bellows |
| Loose supplied clamps | Two size 048 and one size 056 |
| MAF interface | Original cartridge and original two T25 screws transfer; sensor aligns with flat flange |
| Measured airflow | Pro DRY S 465 versus original 385 CFM at 7 inches H2O; oiled 480 is separate |
| Dyno qualification | Selected dry report marks +7.30 hp / +6.41 lb-ft at 6000 rpm versus maxima +4.08 hp / +1.41 lb-ft |
| Emissions | Current manufacturer/manual: not CARB exempt; California restriction |
| UPC | 802959544570 |
| 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 | 21-91108 | Selected Pro DRY S oil-free filter |
| 1 | 05-46405B1 | Tube 1 of 2 |
| 1 | 05-46405B2 | Tube 2 of 2 |
| 1 | 05-46405B3 | Housing |
| 1 | 05-01480 | Silicone bellows coupling |
| 2 | 03-50007 | Size 048 clamps |
| 1 | 03-50009 | Size 056 clamp |
| 1 | 05-01482 | Auxiliary airbox opening plug |
The alternate oiled filter in the shared bill is not supplied as a second selected filter. Original MAF cartridge and sensor, its two screws, three housing grommets, scoop, rubber trim and scoop hardware are retained. No new MAF cartridge or screws are itemized. Selected current primary and replacement-filter dimensions specify a 7.5-inch inverted-top filter; older retailer 8-inch wording is a source/revision conflict. The flowchart heading says Momentum GT while selected primary and manual identify Momentum ST; chart measurements retain that naming qualification.
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 21-91108 Pro DRY S oil-free filter with three synthetic layers, 4-inch flange and 7.5-inch height.
Is a MAF cartridge included?No. Transfer the original cartridge, sensor and both original T25 screws.
How does the cartridge align?Align the sensor with the shorter tube flat flange and seat the cartridge flush against the longer tube lip.
Which original mounts and duct parts remain?Three original housing grommets, original scoop, its screws and transferred rubber trim remain.
Why keep the key outside and wait?The exact manual directs keeping the key outside and waiting five minutes after opening the hood for computer shutdown.
Does the auxiliary plug change the inlet?The plug closes the additional housing inlet. The manual associates an open inlet with more flow and the plug with lower noise.
Does the 7 hp / 6 lb-ft claim describe peak-to-peak differences?The selected dry chart marks 7.30 hp and 6.41 lb-ft at 6000 rpm; run-max differences are 4.08 hp and 1.41 lb-ft.
What torque and recheck apply?No numeric torque is specified. Secure all clamps, MAF plug, screws and mounts, then recheck after 100-200 miles.
Verify aFe 51-46405. Read all twenty pages and figures A-N. Keep key outside vehicle; open hood and wait five minutes for computer shutdown. Observe the manual negative-battery warning and work on a cool engine. Release MAF connector tab. Remove two original scoop screws with T25, push scoop toward engine then lift. Transfer rubber trim from old airbox to scoop. Loosen both original tube clamps and remove tube. Lift rear housing mount first, then release the other two mounts. Remove original MAF cartridge and its two T25 screws. Insert cartridge into shorter supplied tube, align sensor with flat flange and reuse both screws. Transfer all three grommets to supplied housing and seat housing. Fit selected filter; optional plug closes auxiliary opening for lower noise, while manual associates open inlet with more airflow. Restore original scoop with its hardware. Fit bellows and first 048 clamp at throttle body and secure. Insert longer tube with second 048 clamp tight enough to allow alignment rotation without pulling out. Fit 056 clamp at its opposite end. Insert shorter tube with attached MAF cartridge into filter, then connect cartridge to longer tube. Adjust until cartridge sits flush against tube lip, secure 056 and all remaining clamps, reconnect MAF plug and lock tab. Verify all connections, mounts, screws and clearance; restore battery connection if disconnected. No numeric clamp torque is specified. Recheck after 100-200 miles.
Actual linked chart gives selected Pro DRY S 465 CFM, oiled 480 CFM and original 385 CFM at 7 inches H2O. Selected dry difference is about 20.8 percent, rounded to 21. The GT chart heading differs from selected ST naming. Actual selected dry 2018 Atlas 3.6L dyno identifies PDS Final Run and marks 235.57 versus 228.27 hp and 206.20 versus 199.79 lb-ft at 6000 rpm: 7.30 hp and 6.41 lb-ft. Run maxima are 235.63 versus 231.55 hp and 238.72 versus 237.31 lb-ft, differences 4.08 hp and 1.41 lb-ft. Both June 15, 2018 runs use SAE 1.03, fourth gear and silver fan; selected dry run precedes baseline by approximately twenty-four minutes and weather differs. Point gains are not peak-to-peak gains or guaranteed results for every trim. Current manufacturer and exact manual state not CARB exempt, unavailable for purchase in California or use on California-registered vehicles. No EO exemption is established.
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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