The aFe 31-10327 replaces the original airbox filter in the specified applications with oil-free synthetic media. The current exact manufacturer lists Impreza 2017β2026, Crosstrek 2018β2026, Forester 2019β2026, Ascent 2019β2025, Legacy 2020β2025 and Outback 2020β2026. It specifies three layers of oil-free synthetic media; this is a particular OE panel, not a universal hose-mounted filter. The original named-trim rows retain their existing individual years rather than inheriting every current family endpoint. Exact dry-part Import Image Racing and a separate named-trim retailer table independently identify WRX 2022β2026 beyond the primary headline. Four bounded WRX rows are added from that exact-part evidence: Premium/Limited/GT 2022β2026 and the separately bounded Base 2022β2024 scope without a pseudo-trim label. They require the actual 2.4L engine and original housing; no earlier WRX or STI application is inferred. The retained Crosstrek Hybrid row has exact-part retailer support but remains generation/powertrain specific, not approval of every later hybrid. Additional WRX special editions and later named trims are recorded but not newly mapped from a generic year range.
| Detail | Value |
|---|---|
| Current Impreza / Crosstrek / Forester families | Manufacturer ranges 2017β2026 / 2018β2026 / 2019β2026; existing named rows retain own bounds |
| Current Ascent / Legacy / Outback families | Manufacturer ranges 2019β2025 / 2020β2025 / 2020β2026; existing named rows retain own bounds |
| WRX retailer applications | Premium / Limited / GT 2022β2026 and bounded Base 2022β2024 exact dry-part evidence; original 2.4L housing required |
| Crosstrek Hybrid | Existing 2019β2021 row retained with exact generation/powertrain condition |
| Other models / special editions | No earlier WRX/STI, extra special-edition or all-Subaru housing inference |
31-10327: verify the exact engine, original element and housing. Model or trim names alone do not establish all-engine interchangeability.
| Detail | Value |
|---|---|
| Manufacturer Part Number | 31-10327 |
| Media | Pro DRY S; oil-free synthetic media |
| Configuration | One OE-replacement air-filter element; original housing retained |
| Pleat description | Rounded open pleats; no unverified overall dimensions |
| 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 exact current primary specifies three synthetic layers and oil-free cleaning. |
| Flow statement | The current exact manufacturer supplies no numerical flow-gain or efficiency percentage. An oiled filter gain or generic dry-media figure is not substituted as a verified current result. |
| Emissions | Exact manufacturer page states this filter does not require a CARB EO number; other modifications are not certified by that statement |
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 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 exact manufacturer lists Impreza 2017β2026, Crosstrek 2018β2026, Forester 2019β2026, Ascent 2019β2025, Legacy 2020β2025 and Outback 2020β2026. It specifies three layers of oil-free synthetic media; this is a particular OE panel, not a universal hose-mounted filter. The original named-trim rows retain their existing individual years rather than inheriting every current family endpoint. Exact dry-part Import Image Racing and a separate named-trim retailer table independently identify WRX 2022β2026 beyond the primary headline. Four bounded WRX rows are added from that exact-part evidence: Premium/Limited/GT 2022β2026 and the separately bounded Base 2022β2024 scope without a pseudo-trim label. They require the actual 2.4L engine and original housing; no earlier WRX or STI application is inferred. The retained Crosstrek Hybrid row has exact-part retailer support but remains generation/powertrain specific, not approval of every later hybrid. Additional WRX special editions and later named trims are recorded but not newly mapped from a generic year range.
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 exact current primary specifies three synthetic layers and oil-free cleaning.
Does the flow percentage guarantee more engine power?The current exact manufacturer supplies no numerical flow-gain or efficiency percentage. An oiled filter gain or generic dry-media figure is not substituted as a verified current result.
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 WRX absence from the headline prove it cannot fit?No. Exact dry-part retailers independently identify the later 2.4L WRX, with separately bounded named trims. Those application details are retailer evidence rather than an inferred approval from a shared Subaru badge; earlier WRX/STI housings are not included by that evidence.
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 exact current primary specifies three synthetic layers and oil-free cleaning. 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.
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.
31-10327: verify the original filter interface before operation.
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