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The K&N High‑Flow drop‑in replacement air filter for 2019–2020 Subaru WRX STI 2.5L is a washable, reusable filter that improves airflow and helps increase horsepower while protecting the engine. Its layered, oiled cotton media traps contaminants and cleans for repeated use. Built to fit the factory air box for simple installation, it’s backed by K&N’s long-term warranty and reduces disposable filter waste.
K&N 2019 Subaru WRX STI 2.5L F/I Replacement Air Filter
