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Pro DRY S replacement with the correct engine and housing
The aFe 31-10161 replaces the original airbox filter in the specified applications with oil-free synthetic media. The current manufacturer identifies Forester/Impreza/Outback/WRX/STI2008β2019 under2.0L/2.5L naturally aspirated and turbo four-cylinder families. Exact per-part retailer tables also positively identify the carried older Legacy/Outback, B9 Tribeca2006β2007 3.0L and Tribeca2008β2014 3.6L, plus Legacy/Outback H6 applications; those are qualified engine/housing scopes beyond the short primary heading, not presumed contamination. Exact retailer tables identify Impreza2017β2018 2.0L and WRX2015β2020 2.0L beyond narrower retailer or primary endpoints; original bounds remain with that source qualification. Legacy2.5i Sport2015β2016 is restored between the existing2014 and2017β2019 coverage using an exact dry-part named table. Original disjoint gaps and individual engine-specific rows remain unchanged elsewhere. No newer Crosstrek generation, S209 airbox,2022-plus WRX or all-Subaru fitment is inferred from a shared badge.
Key Features
- Oil-free synthetic filtration media.
- Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
- Rounded open pleats provide usable filter area and dust-holding capacity.
- Full polyurethane perimeter frame and progressive bump seal.
- The exact current primary describes airflow and dust capacity qualitatively, without a numerical airflow-gain, horsepower or efficiency result. No generic retailer percentage or different-media test is substituted.
Fitment
| Detail | Value |
|---|---|
| Current primary family | Forester/Impreza/Outback/WRX/STI2008β2019;2.0L/2.5L four-cylinder original housings |
| H6 / older scopes | Exact retailer positive B9 Tribeca/Tribeca and Legacy/Outback3.0L/3.6L retained qualified beyond short primary heading |
| Later original bounds | Impreza2017β2018 and WRX2020 exact retailer scopes retained with original engine/housing qualifiers |
| Restored Sport range | Legacy2.5i Sport2014β2019 exact retailer table fills2015β2016 gap |
| Configuration | One panel; three progressively finer oil-free synthetic layers; original airbox retained |
31-10161: verify the exact engine, original element and housing. Model or trim names alone do not establish all-engine interchangeability.
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 31-10161 |
| Media | Pro DRY S; oil-free synthetic media |
| Configuration | One OE-replacement air-filter element; original housing retained |
| Pleat description | Rounded open pleats; no verified numeric pleat depth on the exact current primary |
| Frame / seal | Polyurethane perimeter frame; progressive bump seal |
| Service | Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media. |
| Flow statement | The exact current primary describes airflow and dust capacity qualitatively, without a numerical airflow-gain, horsepower or efficiency result. No generic retailer percentage or different-media test is substituted. |
| Emissions | Exact manufacturer page states this filter does not require a CARB EO number; other modifications are not certified by that statement |
What's Included
- One Pro DRY S OE-replacement air-filter element.
- No complete airbox, intake tube, sensor, separate coupler kit or filter-service supplies are documented as included.
About aFe Power
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
Related Parts
- Browse aFe Power filter configurations; compare the exact original housing and engine.
- Manufacturer filter-media maintenance guidance; follow the oil-free Pro DRY S cleaning routine.
Frequently Asked Questions
What is the 31-10161?One Pro DRY S OE-replacement air-filter element for the verified housing and engine application described here; this is not a complete intake system.
Which application should I verify?The current manufacturer identifies Forester/Impreza/Outback/WRX/STI2008β2019 under2.0L/2.5L naturally aspirated and turbo four-cylinder families. Exact per-part retailer tables also positively identify the carried older Legacy/Outback, B9 Tribeca2006β2007 3.0L and Tribeca2008β2014 3.6L, plus Legacy/Outback H6 applications; those are qualified engine/housing scopes beyond the short primary heading, not presumed contamination. Exact retailer tables identify Impreza2017β2018 2.0L and WRX2015β2020 2.0L beyond narrower retailer or primary endpoints; original bounds remain with that source qualification. Legacy2.5i Sport2015β2016 is restored between the existing2014 and2017β2019 coverage using an exact dry-part named table. Original disjoint gaps and individual engine-specific rows remain unchanged elsewhere. No newer Crosstrek generation, S209 airbox,2022-plus WRX or all-Subaru fitment is inferred from a shared badge.
Is the Pro DRY S media oiled?Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
Does the flow percentage guarantee more engine power?The exact current primary describes airflow and dust capacity qualitatively, without a numerical airflow-gain, horsepower or efficiency result. No generic retailer percentage or different-media test is substituted.
How does this filter seal?Its progressive bump seal and full polyurethane perimeter frame conform to the original housing. The manufacturer says separate filter gaskets or sealants are not required; the existing housing must still close and secure correctly.
Are a hose coupler and cleaning kit supplied?The exact listing identifies an OE-replacement filter. A generic Coupler Included field does not establish a separate hose package; no airbox, tube, sensor, cleaner or oil bottle is documented as supplied.
Does the four-cylinder headline exclude all the original H6 rows?No. Exact per-part retailers positively list the original B9 Tribeca/Tribeca and Legacy/Outback H6 scopes. They remain bounded engine/housing qualifications; the short primary heading alone is not proof of physical incompatibility or permission to add other H6 applications.
When should I clean it?Inspect according to actual dust exposure and restriction. Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media. Use low-pressure rinse from the clean side toward the dirty side, let the element dry naturally before reinstalling. Do not use heat, compressed air or any filter oil. Do not treat an older general-care mileage example as a guaranteed interval for every vehicle or environment.
Installation Instructions
- Read the exact manufacturer product information for 31-10161 and the original vehicle airbox service procedure.
- With the engine off and cool, compare the new filter and original element, including the sealing interface. Resolve an engine or housing mismatch before installation.
- Open the original housing according to its service procedure, remove the old element and keep debris out of the clean intake path. Clean the housing seat.
- Seat the polyurethane frame evenly without folding the bump seal or adding sealant. Close and secure the original housing and inspect all its attachments.
- Washable oil-free synthetic media. Use the specified aFe POWER CLEANER, rinse appropriately and dry fully; do not apply air-filter oil. The current exact manufacturer specifies three layers of oil-free synthetic media.
No vehicle-specific installation PDF or numeric airbox torque is linked on this exact manufacturer page. Follow the original housing service procedure and the correct oil-free Pro DRY S maintenance directions. Read the manufacturer media maintenance guidance.
31-10161: verify the original filter interface before operation.
California Proposition 65 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.
- 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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