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K&N Replacement Air Filter for 19-21 STi (33-5092) JMF • Bolt-On Design Retains CrashK&N drop in factory style replacement panel air filter for the 2019 2021 STi. Designed to install easily into your stock air box and increase power. K&N filters are washable, reusable and engineered to last for the entire lifespan of your vehicle. Vehicle Fitment: 2019 2021 Subaru STi Includes: (1) Air Filter Replacement for these OEM Part Numbers: Subaru 16546AA180 33 5092 Specs: Air Filter Shape: Panel Filter Material: Cotton Gauze Washable: Yes