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Upgrade your vehicle's performance with the K&N E-0668 high-flow replacement air filter, designed specifically for models including the 2008-2014 Audi R8 and 2013-2014 Porsche Boxster and Cayman. Crafted with layered, oiled cotton media, this washable and reusable filter enhances airflow into the engine, which can lead to increased horsepower and improved throttle response. Its advanced design captures contaminants effectively while allowing maximum airflow, ensuring your vehicle runs efficiently and reliably. The K&N E-0668 is engineered for easy installation as a drop-in replacement, fitting seamlessly into your factory air box without modifications. This durability-oriented filter is built to last the lifespan of your vehicle, providing consistent performance over time and backed by K&N*s 10-Year/Million Mile Limited Warranty. Whether you're upgrading for performance or filtration, this filter ensures your engine receives the clean, high-volume airflow it needs for optimal operation. Maintaining your vehicle*s power and protection, the K&N E-0668 is a trusted choice for enthusiasts seeking quality aftermarket upgrades. Suitable for a range of high-performance vehicles, this filter offers a reliable, long-lasting solution to enhance your driving experience.
Features:
Fitment:
2008 Audi R8 Base
2009 Audi R8 Base
2010 Audi R8 Base
2011 Audi R8 Base
2011 Audi R8 Spyder
2012 Audi R8 Base
2012 Audi R8 Spyder
2013 Porsche Boxster Base
2013 Porsche Boxster S
2014 Audi R8 Base
2014 Audi R8 Spyder
2014 Porsche Boxster Base
2014 Porsche Boxster S
2014 Porsche Cayman Base
2014 Porsche Cayman S
2015 Audi R8 Base
2015 Audi R8 Spyder
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).
