aFe Power 31-10208 Magnum FLOW Pro DRY S Air Filter

The 31-10208 is a drop-in OE-replacement filter using aFe's three-layer non-oiled dry synthetic media in a 360-degree polyurethane frame with a progressive bump seal. The oil-free design eliminates the MAF sensor contamination concern associated with oiled cotton gauze filters in this application. aFe's product listing describes "excellent airflow and efficient filtration" but cites no named test standard (ISO 5011, SAE J726, or equivalent), and no independent third-party filtration data was found for this SKU; the filtration score is capped at the manufacturer-only evidence level as a result. Community reviews across 2015-2025 consistently note improved throttle response and drop-in fitment across 4Runner and FJ Cruiser model years. One Arizona-based 4Runner owner specifically notes keeping the OEM paper filter for high-dust off-road use, which is worth noting for owners who wheel in dusty conditions. The filter carries a Limited Lifetime Warranty; the washable design eliminates ongoing replacement costs over the vehicle ownership period.

Right pick for a 4Runner, GX460, or FJ Cruiser owner who wants to eliminate recurring filter replacement costs and is comfortable with periodic dry-filter cleaning maintenance. Community confirms drop-in fitment across all 5th gen 4Runner model years reviewed (2015, 2016, 2019) and both FJ Cruiser years (2011, 2014). Skip if you regularly drive in heavy dust or off-road desert environments; aFe explicitly positions this as "recommended for street and light off road use," and community owners confirm that even dry synthetic media is less suited to extreme dust than a fresh OEM paper element. Skip also if independently verified filtration efficiency data (ISO 5011 or equivalent) is a purchasing requirement; aFe has not published a named test standard for this SKU.

Passive replacement component with no chemical exposure pathway during installation or removal; no SDS applies to the filter itself. The environment score of 7.3 reflects the washable reusable lifecycle: a single filter designed to last the life of the vehicle eliminates 4-8 paper filter replacement cycles, with the oil-free design removing the small chemical waste stream associated with oiled reusable filters. If aFe's separate cleaning kit is used during filter maintenance, review that product's safety data for PPE guidance.

An engine air filter only does its job if it actually fits your car, and the same vehicle often takes a different part year to year. Before you buy, find the engine air filter for your vehicle in the CarCareTruth air-filter finder · pick your year, make, and model and we'll show the filters that fit it, ranked by our independent score and cross-checked against multiple catalog fitment sources.