aFe 51-81022-1 is the Magnum FORCE Stage-2 Si Pro DRY S intake for qualified Ford 6.0L Power Stroke diesel applications. One 21-91143 oil-free element uses three progressive synthetic layers. The exact suffix bill identifies tube 05-73003B1 and housing 05-81022B2. Retain the original MAF or temperature sensor, factory coupler and filter minder; the supplied adapter accommodates the temperature-sensor arrangement.
The exact manufacturer suffix manual names F-250/F-350/F-450/F-550 2003-2007 with the 6.0L turbo diesel. Restore the broad F-250/F-350 starting year to 2003 and add the two missing model-level F-450/F-550 rows from that exact manual. Exact selected dry-part named tables support the restored Super Duty trim groups; F-250 Lariat/XL/XLT and F-350 King Ranch/Lariat/XL/XLT have specific 2003 positives, while the Harley-Davidson rows and F-250 King Ranch begin in 2004. F-450/F-550 Lariat/XL/XLT named proof reviewed here covers 2004-2007; their earlier 2003 coverage remains model-level rather than being spread to named trims. Exact XDP supports Excursion 2003-2005 6.0L at model level, while reviewed named tables begin in 2004. Retain all four original Excursion 2004-2005 named bounds without inferring earlier named rows from a different intake. Some retailer tables start all truck trims in 2004; the exact earlier positives and actual sensor arrangement qualify that difference. Unrelated Mustang rows in one retailer table are not used. No 7.3L, 6.4L or gasoline scope is inferred.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2004-2005 | Ford | Excursion | Eddie Bauer |
| 2004-2005 | Ford | Excursion | Limited |
| 2004-2005 | Ford | Excursion | XLS |
| 2004-2005 | Ford | Excursion | XLT |
| 2003-2007 | Ford | F-250 | 6.0L turbo diesel; verify sensor and actual configuration |
| 2003-2007 | Ford | F-350 | 6.0L turbo diesel; verify sensor and actual configuration |
| 2003-2007 | Ford | F-450 | 6.0L turbo diesel; verify sensor and actual configuration |
| 2003-2007 | Ford | F-550 | 6.0L turbo diesel; verify sensor and actual configuration |
| 2004-2007 | Ford | F-250 Super Duty | Harley-Davidson Edition |
| 2004-2007 | Ford | F-250 Super Duty | King Ranch |
| 2003-2007 | Ford | F-250 Super Duty | Lariat |
| 2003-2007 | Ford | F-250 Super Duty | XL |
| 2003-2007 | Ford | F-250 Super Duty | XLT |
| 2004-2007 | Ford | F-350 Super Duty | Harley-Davidson Edition |
| 2003-2007 | Ford | F-350 Super Duty | King Ranch |
| 2003-2007 | Ford | F-350 Super Duty | Lariat |
| 2003-2007 | Ford | F-350 Super Duty | XL |
| 2003-2007 | Ford | F-350 Super Duty | XLT |
| 2004-2007 | Ford | F-450 Super Duty | Lariat |
| 2004-2007 | Ford | F-450 Super Duty | XL |
| 2004-2007 | Ford | F-450 Super Duty | XLT |
| 2004-2007 | Ford | F-550 Super Duty | Lariat |
| 2004-2007 | Ford | F-550 Super Duty | XL |
| 2004-2007 | Ford | F-550 Super Duty | XLT |
Verify 51-81022-1 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-81022-1 |
| Selected filter | 21-91143; three oil-free synthetic layers; nine-inch height; elliptical 6.75 x 4.75-inch flange |
| Tube / housing | 05-73003B1 / 05-81022B2 |
| Housing-opening plug | 05-01429; optional configuration per manual |
| Temperature-sensor adapter | 05-01228; used on temperature-sensor vehicles instead of MAF |
| Supplied tool | 03-50066 T20 Torx bit |
| Sensor fasteners | Original MAF screws reused; no new screws itemized |
| Retained connections | Original inlet coupler, filter minder, rubber grommet, hoses and sensor |
| Battery / torque / recheck | Disconnect negative battery terminal; no numeric torque; retighten connections after 100-200 miles |
| Current filter dimensions | Base 8.25 x 6.25 inches; inverted top 7.25 x five inches |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 21-91143 | Selected oil-free Pro DRY S filter |
| 1 | 05-73003B1 | Intake tube |
| 1 | 05-81022B2 | Intake housing |
| 1 | 05-01429 | Auxiliary housing-opening plug |
| 1 | 05-01228 | Temperature-sensor adapter |
| 1 | 03-50066 | T20 Torx bit |
The oiled filter in the shared bill is an alternative, not an extra included element. A filter-flange clamp is illustrated and both intake-tube clamps are secured in the procedure, but no separate clamp size or service number is itemized in this bill. Retain the factory inlet coupler, sensor screws, original rubber minder grommet and filter minder. No new MAF, temperature sensor, coolant hose, separate lower turbo-inlet Torque Booster tube or nonsuffix extra couplings/cover/fasteners are included in this bill. Current housing has a molded diamond-tread pattern and auxiliary opening with optional plug.
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 21-91143 Pro DRY S element with three oil-free synthetic layers and a nine-inch height. The oiled row is a separate configuration.
Does the original MAF sensor transfer?Yes, where fitted. Use the original screws and supplied T20 bit. No new sensor or MAF screws are itemized.
What if the truck uses a temperature sensor instead?The exact manual supports that arrangement using the supplied 05-01228 adapter and original temperature sensor.
Are the factory coupler and filter minder retained?Yes. Reuse the factory inlet coupler, original rubber filter-minder grommet and filter minder.
Is the separate Torque Booster tube included?No. The exact bill supplies the listed intake tube and housing; the separate lower turbo-inlet tube kit is not included.
What happens to the front housing hose clamp?The exact procedure inserts that rubber hose with its spring clamp removed. The coolant hose spring clamp is separately restored and secured.
Does the flow chart use the dry or oiled result?Both media are shown separately: dry 625 versus stock 485 CFM at seven inches H2O is approximately 28.9%. The oiled 680 CFM figure is not the selected dry result.
What battery, torque and inspection instructions apply?Disconnect the negative battery terminal. No numeric torque is supplied. Retighten connections after approximately 100-200 miles.
Verify aFe 51-81022-1. Read all sixteen pages and figures A-K on a cool vehicle. Disconnect the negative battery terminal. Release the two illustrated spring-clamped hoses, keeping the coolant line positioned to prevent leakage; do not disturb hot coolant. Disconnect MAF where equipped, remove the filter minder from its grommet and loosen the original intake clamp. Pull straight up to remove the original intake. Transfer the original rubber filter-minder grommet into the new tube. Transfer MAF with the original screws using the supplied T20 bit. Where the vehicle has a temperature sensor instead of MAF, install the supplied temperature-sensor adapter and insert the original sensor as illustrated. Position the new tube beneath the coolant reservoir temporarily to create installation clearance. Insert the selected filter into the housing with its clamp loose. Seat the housing so its front passes through the core-support panel. Connect the tube into the retained factory coupler and then into the filter; reinstall the filter minder. Secure both tube clamps. At the front housing hose connection, follow the illustrated instruction to insert the rubber hose with its spring clamp removed. Reconnect the sensor harness and coolant hose, securing the coolant spring clamp. The optional housing plug blocks the auxiliary opening; the manual recommends removing it in cold weather to aid engine warm-up. Check every connection and clearance before reconnecting the battery. No numeric torque is provided. Retighten connections after approximately 100-200 miles.
The exact current dry primary, complete sixteen-page suffix manual, bill, assembly diagram and all figures A-K were read and viewed, together with the actual linked airflow chart. The chart heading names the related oiled suffix, but separately reports PDS 625, P5R 680 and stock 485 CFM at seven inches H2O. Its selected dry comparison is approximately 28.9%, consistent with the current 29% headline; the oiled result is not the dry result. No exact dyno chart is linked and no horsepower or torque gain is certified here. The 99.2% filtration-efficiency statement has no linked test report or conditions and remains a manufacturer claim. Current primary and exact manual restrict California purchase/use or street/highway use; no CARB exemption is established. Named-year evidence is retained separately from broad manual model coverage, particularly for F-450/F-550 2003 and Excursion 2003. Earlier named rows are not borrowed from related intake kits. A retailer table includes unrelated Mustang applications; those rows are excluded from all fitment decisions.
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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