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The K&N Engineering 57-2578 57-Series OEM air box intake system is a direct replacement intake solution for select 2011–2014 Ford Mustang GT models with the 5.0L V8 engine. It combines a CAD-designed high-airflow intake tube with a washable, reusable oiled cotton air filter designed to fit into the factory air box. This configuration provides a straightforward performance upgrade while retaining the factory air box.
The included high-flow filter is intended to replace the factory filter and can go up to 50,000 miles between service intervals under normal highway driving conditions. Its washable and reusable design supports repeated use, while K&N states that the system provides engine protection and is designed to increase horsepower and torque. The application-specific design supports a precise fit for the listed vehicle application.
The intake kit can typically be installed in less than 90 minutes using standard hand tools. It is described as legal in all 50 states and carries the K&N 10-Year/Million Mile Limited Warranty. The product data identifies EPA compliance and lists CARB Executive Order number D-269-48. Service-related associated products include the 33-2431 Replacement Air Filter and 99-5000 Filter Care Service Kit Aerosol.
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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).
