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Upgrade your 2019-2021 Subaru WRX STI with the K&N Engineering 33-5092 High-Flow Replacement Air Filter, designed to enhance engine performance through superior airflow. Crafted with layered, oiled cotton media, this washable and reusable filter captures contaminants effectively while boosting horsepower and maintaining optimal engine protection. Its innovative design allows for easy installation into your factory air box, making it a straightforward upgrade for any enthusiast seeking improved engine efficiency. Built to last the entire lifespan of your vehicle, this air filter is backed by K&N's 10-Year/Million Mile Limited Warranty, ensuring long-term reliability and performance. Whether you're on the street or on the track, this filter delivers consistent airflow and engine protection, making it a popular choice among Subaru WRX STI owners seeking dependable, high-performance filtration. Its durable construction ensures it withstands the rigors of daily driving and high-performance conditions, providing a cost-effective solution that combines performance and sustainability. Trust in the quality and expertise of K&N Engineering to keep your vehicle running smoothly and efficiently for years to come.
Features:
Fitment:
2019 Subaru WRX STI Base
2019 Subaru WRX STI Limited
2019 Subaru WRX STI S209
2020 Subaru WRX STI Base
2020 Subaru WRX STI Limited
2021 Subaru WRX STI Base
2021 Subaru WRX STI Limited
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
