aFe 51-74006-1 is the Momentum HD intake with one oil-free Pro DRY S 21-91059 filter for specified GM Silverado HD/Sierra HD 2011–2016 6.6L LML Duramax diesel applications. The exact shared manufacturer manual identifies this dry configuration; the selected hardware and procedure below follow that manual rather than another engine family.
Primary manual and manufacturer application-guide coverage is 2011–2016 Silverado HD/Sierra HD with the actual LML 6.6L turbo diesel. Original application bounds and gaps remain unchanged. Match engine generation, original sensors, inlet layout and mounting; named HD trims also offer gas engines, which are not approved by this diesel kit. No later generation or sibling-kit extension is inferred. The original missing Silverado 3500 HD LT and earlier Sierra Base/WT scopes remain follow-up holds until an exact named-trim table is resolved. The broad manufacturer engine family is not converted into new blanket trim rows.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2011-2016 | Chevrolet | Silverado 3500 HD | LTZ |
| 2011-2016 | Chevrolet | Silverado 3500 HD | WT |
| 2015-2016 | GMC | Sierra 2500 HD | Base |
| 2011-2016 | GMC | Sierra 2500 HD | Denali |
| 2011-2016 | GMC | Sierra 2500 HD | SLE |
| 2011-2016 | GMC | Sierra 2500 HD | SLT |
| 2015-2016 | Chevrolet | Silverado 2500 HD | High Country |
| 2011-2016 | Chevrolet | Silverado 2500 HD | LT |
| 2011-2016 | Chevrolet | Silverado 2500 HD | LTZ |
| 2011-2016 | Chevrolet | Silverado 2500 HD | WT |
| 2015-2016 | Chevrolet | Silverado 3500 HD | High Country |
| 2015-2016 | GMC | Sierra 3500 HD | Base |
| 2011-2016 | GMC | Sierra 3500 HD | Denali |
| 2011-2016 | GMC | Sierra 3500 HD | SLE |
| 2011-2016 | GMC | Sierra 3500 HD | SLT |
| 2011-2014 | GMC | Sierra 3500 HD | WT |
Verify 51-74006-1 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-74006-1 |
| Product type | Momentum HD cold air intake |
| Selected filter | One 21-91059, three-layer oil-free synthetic Pro DRY S |
| Tube / housing | 05-74006B1 / 05-82302B2 |
| Coupling / clamps | 05-01430 double-hump; two 03-50319 4-7/16-inch T-bolts plus one 03-50267 large clamp |
| Seal / auxiliary plug | 26-inch 7/16-inch 05-00072 / 05-01202 |
| Sensor hardware | Four Torx M4 x 0.7 x 8 mm 03-50491 screws; two M4 x 12 mm 03-50455 screws for block-off branch |
| Humidity branch | Original humidity-sensor gasket if fitted; otherwise gasket 05-00631 and plate 05-01372 |
| Filter minder branch | Transfer original minder and grommet; otherwise use tabbed plug 03-50766 |
| Temperature sensor | Reconnect original sensor harness routed across intake tube |
| Torque / recheck | No numeric torque; check bolts, clamps and connectors after 200 miles |
| UPC | 802959542484 |
| 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 | 21-91059 | Selected Pro DRY S filter |
| 1 | 05-00072 | 7/16-inch seal trim, 26 inches |
| 1 | 05-82302B2 | Housing |
| 1 | 05-01202 | Auxiliary-inlet urethane plug |
| 1 | 03-50267 | Large 8-5/16-inch T-bolt clamp |
| 1 | 05-74006B1 | Intake tube |
| 1 | 05-00631 | Gasket for absent-humidity-sensor branch |
| 1 | 05-01372 | Humidity-port block-off plate |
| 2 | 03-50455 | M4 x 12 mm flathead screws |
| 4 | 03-50491 | Torx M4 x 0.7 x 8 mm screws |
| 2 | 03-50319 | 4-7/16-inch T-bolt clamps |
| 1 | 05-01430 | Silicone double-hump coupling |
| 1 | 03-50766 | Tabbed filter-minder-port plug |
Each exact shared manufacturer manual explicitly names the selected dry part and one 21-91059 filter. The current service-filter page confirms three oil-free synthetic layers, 6-inch flange and 9-inch height; its headline rounds base/top to 8 inches while detailed text says 8-1/8 inches. Alternative oiled-filter rows are not additional filters. No current exact dry-kit product page was located; the original manufacturer application guide and exact shared manual remain the primary evidence, with current oiled-family pages used only where identified. Do not apply the oiled filter’s 1,000-CFM or efficiency claims to this dry configuration. Humidity-sensor and no-humidity-sensor branches are alternatives, not instructions to install a sensor and block-off simultaneously. The filter minder and tabbed plug are likewise alternatives. The original bottom retaining plug and mounting grommets remain factory transfers. This LML BOM’s four short Torx screws and two longer flathead screws are not the L5P or LMM screw quantities.
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 oil-free 21-91059 Pro DRY S filter. Alternative media rows in the shared manual are not additional included filters.
Can this be used on every GM HD engine?No. Verify the exact LML 6.6L diesel, model year, sensor arrangement and inlet hardware. Gas engines and other diesel generations are not inferred.
Is a current exact dry-kit product page available?The current exact dry page was not located. The manufacturer guide and explicitly shared exact manual support this audit; related oiled pages remain separately qualified.
What if there is no humidity sensor?Use the supplied gasket, block-off plate and two M4 x 12 mm flathead screws. Do not install a sensor and block-off in the same port.
What if the truck has no filter minder?The manual provides the tabbed plug for that port. Trucks with the minder reuse it and its original grommet.
Which end is connected first?Place the coupling into the turbo inlet tube first, then rotate the tube downward into the filter before final tightening.
Is the oiled sibling’s airflow an independent dry test?No. Only clearly labeled media comparisons and the exact dry guide claims are identified as such; a related oiled graph is qualified.
What torque and recheck interval apply?No numeric torque is stated. Recheck after 200 miles using the selected manual.
Verify aFe 51-74006-1. Use a cool engine and disconnect the negative battery as directed. Disconnect MAF, temperature and humidity connections present on the vehicle, loosen the clamps and lift out the original tube and airbox. Loosely seat the selected filter and large T-bolt in the new housing; follow the manual’s initial clamp fit-and-tighten recommendation. Install the 26-inch seal and transfer the bottom retaining plug, then firmly seat the housing in the original grommets. Transfer MAF and humidity sensor with the factory humidity gasket using the supplied short Torx screws. If no humidity sensor is fitted, use the supplied gasket, block-off plate and two M4 x 12 mm flathead screws instead. Transfer the original filter minder and grommet, or close that port with the tabbed plug when no minder is fitted. Loosely fit the double-hump coupling and two T-bolt clamps. Insert the coupling into the turbo inlet tube first, then rotate the intake tube down into the filter and tighten the clamps. Reconnect MAF and humidity connections, route the original temperature-sensor harness across the tube and reconnect it. Reconnect the negative battery and fit the optional auxiliary plug if desired. Check bolts, clamps and connectors after 200 miles. No numeric torque is provided.
The manufacturer guide’s exact dry row advertises 52-percent airflow and up to 22 hp/57 lb-ft. The current oiled-family bench chart is labeled for the oiled sibling and shows 310 versus 204 CFM at 1.5 inches H2O, about 52 percent; it is not independently identified as a dry-filter test. The sibling-linked dyno likewise is a family comparison: marked power 286.87 versus 264.97 differs by 21.90 hp and torque 752.30 versus 694.89 differs by 57.41 lb-ft. Independent peaks 353.55 versus 347.82 hp differ by 5.73 hp, and 757.93 versus 722.28 lb-ft differ by 35.65 lb-ft. Both runs use fourth gear, 30-percent brake and DPF-back exhaust. October 2, 2012 baseline conditions are 89.77°F/29.29 in-Hg/23%/SAE 1.02, versus intake 97.01°F/29.28/14%/SAE 1.03. Conditions and point-versus-peak comparisons differ; no independent selected dry-media result is certified. The manufacturer guide and current sibling cite D-550-18. Official indexed Exhibit A text names the exact dry part and 2011–2016 Silverado HD/Sierra HD 6.6L; direct official access presented a robot-verification challenge and was stopped, so full current application-specific legal verification remains qualified. A replacement filter’s no-EO-required statement does not establish whole-kit legality.
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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