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The aFe 48-46101 pair uses 1-5/8-inch 16-gauge 409 stainless tubing, TIG welds, symmetrical tube routing, mitered merged collectors and 3/8-inch head flanges. Exact applications cover Frontier 2005–2019, Pathfinder 2005–2012 and Xterra 2005–2015 gasoline V6 4.0L. Original primary/secondary catalysts, gaskets and sensors are restored as directed; the guide explicitly says original manifold heatshields are not reused.
All named rows require gasoline V6 4.0L within the manufacturer’s individual model years: Frontier 2005–2019, Pathfinder 2005–2012 and Xterra 2005–2015. The full exact-MPN named table supports all original scopes plus Frontier SV 2011–2019 and Xterra Off-Road 2005–2010. Shared model names or displacement do not approve other engines or later years. Physical scope is distinct from exact EO coverage.
| Years | Make | Model | Submodel | Required configuration / emissions qualification |
|---|---|---|---|---|
| 2013-2019 | Nissan | Frontier | Desert Runner | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2010 | Nissan | Frontier | LE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2008 | Nissan | Frontier | Nismo Off-Road | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2009-2019 | Nissan | Frontier | PRO-4X | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2019 | Nissan | Frontier | S | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2010 | Nissan | Frontier | SE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2019 | Nissan | Frontier | SL | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2019 | Nissan | Frontier | SV | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2012 | Nissan | Pathfinder | LE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2006-2012 | Nissan | Pathfinder | S | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2010 | Nissan | Pathfinder | SE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2009 | Nissan | Pathfinder | SE Off-Road | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2012 | Nissan | Pathfinder | Silver Edition | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2012 | Nissan | Pathfinder | SV | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005 | Nissan | Pathfinder | XE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2010 | Nissan | Xterra | Off-Road | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2011-2015 | Nissan | Xterra | PRO-4X | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2015 | Nissan | Xterra | S | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2005-2010 | Nissan | Xterra | SE | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| 2006-2015 | Nissan | Xterra | X | Gasoline V6 4.0L only; match exact EO year/part/vehicle conditions before claiming California exemption. |
| Detail | Value |
|---|---|
| Manufacturer Part Number | 48-46101 |
| Product type | Headers & Manifolds |
| Construction | 1-5/8-inch 16-gauge 409 stainless mandrel-bent tubing, TIG welding, symmetrical tube design, mitered merged collectors and 3/8-inch head flanges. Flange alloy and outlet diameter are not printed. |
| Selected assemblies / bill | Left 05-44543 and right 05-44544, one each; two nuts 03-50047, two screws 03-50046 and one CARB decal 06-20012. No new gaskets or catalysts are in the bill. |
| Selected guide | One page, all 27 steps, complete bill and product photo; document 06-85538 updated April 2019. Supports the three exact model/year scopes above. |
| Original gasket / catalyst reuse | Reuse both head gaskets and original head nuts, tightening center outward. Restore primary catalysts with original crush gaskets/four original nuts plus supplied hardware; restore secondary catalysts with their original gaskets/nuts. |
| Sensors / heatshields | Label left/right secondary catalysts and all original sensor positions. Restore pre-catalyst sensor harness connections and after-catalyst sensors. Both original manifold heatshields are explicitly not reused; no missing restoration step is inferred. |
| Torque / service interval | No numerical torque, fixed clearance or mileage recheck interval is printed. Use exact current vehicle service requirements; no unrelated band-clamp torque or 50–100-mile interval is substituted. |
| Performance evidence | 12 hp and 19 lb-ft are manufacturer up-to claims. No selected linked dyno or airflow chart is provided to independently establish peak differences, test vehicle, modifications, dates or correction factors. |
| Emissions qualification | Manufacturer references D-550-12 for some or all listed applications. The complete official application table is unverified after an earlier direct official PDF returned 403; it was not retried. Exact-year/part California exemption is not cleared from the broader physical fitment headline alone. Apply the enclosed EO identification label on a smooth clean surface on/near the device as directed. |
| UPC | 802959480090 |
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
It is the selected 409 stainless header pair for the listed Nissan Frontier, Pathfinder and Xterra gasoline V6 4.0L configurations, with the specified connection hardware and EO decal.
Are these 304 stainless headers?The exact manufacturer specifies 16-gauge 409 stainless tubing, TIG welding and 3/8-inch head flanges. The flange alloy is not separately printed.
Are new gaskets and catalysts included?The formal bill contains the two headers, two nuts, two screws and an EO decal. The procedure reuses original head gaskets, catalyst gaskets and both original primary/secondary catalyst assemblies.
Which original heatshields are restored?The selected guide explicitly says the original left and right manifold heatshields are not reused. This product’s instruction is distinct from other header guides that omit shield disposition.
How are original O2 sensors handled?Label left/right components and sensor positions, restore pre-catalyst harness connections with wires clear of the headers, and reinstall after-catalyst sensors in the original secondary catalyst pipes.
Is 12 hp/19 lb-ft a verified peak difference?Those are manufacturer up-to claims. A selected dyno chart and test details are not linked, so peak arithmetic, conditions or every-vehicle gains are not independently established.
Does the current year range prove California exemption?No. Manufacturer cites D-550-12 for some or all applications, but the exact official application table remains unverified. Match exact part, vehicle/year and all EO conditions before claiming exemption, and follow the EO label instruction.
What torque and mileage recheck are printed?Neither a numerical torque nor mileage recheck interval appears in the selected 27-step guide. Tighten retained head nuts center outward and use current exact vehicle service requirements.
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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