K&N E-0668 Replacement Air Filter — Fits 2008-2013 Audi R8 4.2L V8 & Porsche Boxster/Cayman

SKU: KNNE-0668
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Sale price$329.99
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N E-0668 High-Flow Replacement Air Filter — Unleash Your Vehicle's Potential

Experience a significant boost in performance with the K&N E-0668 High-Flow Replacement Air Filter. Specifically engineered for the 2008-2013 Audi R8 4.2L V8, as well as various Porsche Boxster and Cayman models from 2013-2014, this filter is designed to increase horsepower and acceleration by optimizing airflow to your engine. K&N's legendary washable and reusable cotton gauze media provides superior filtration while allowing for maximum air intake.

Precision Engineered for Performance:

  • Increased Horsepower: Dyno-tested to deliver measurable gains in engine power.
  • Superior Filtration: Advanced layered cotton media captures contaminants effectively.
  • Washable & Reusable: Designed to last the lifetime of your vehicle, saving you money.
  • Easy Drop-in Installation: Replaces your factory air filter directly with no modifications.
  • Vehicle Specific Fitment:
    • 2008-2013 Audi R8 4.2L V8
    • 2013-2014 Porsche Boxster (Base, S)
    • 2014 Porsche Cayman (Base, S)

Invest in the K&N E-0668 air filter to protect your engine and enhance its performance. Enjoy K&N's 10-Year/Million Mile Limited Warranty and feel the difference with GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008-2012 Audi R8 Base
2011-2012 Audi R8 Spyder
2014-2015 Audi R8 Base
2014-2015 Audi R8 Spyder
2013-2014 Porsche Boxster Base
2013-2014 Porsche Boxster S
2014 Porsche Cayman Base
2014 Porsche Cayman S

Product Details

Product Description
Part Numbers
Sizing & Fit

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N E-0668 High-Flow Replacement Air Filter — Unleash Your Vehicle's Potential

Experience a significant boost in performance with the K&N E-0668 High-Flow Replacement Air Filter. Specifically engineered for the 2008-2013 Audi R8 4.2L V8, as well as various Porsche Boxster and Cayman models from 2013-2014, this filter is designed to increase horsepower and acceleration by optimizing airflow to your engine. K&N's legendary washable and reusable cotton gauze media provides superior filtration while allowing for maximum air intake.

Precision Engineered for Performance:

  • Increased Horsepower: Dyno-tested to deliver measurable gains in engine power.
  • Superior Filtration: Advanced layered cotton media captures contaminants effectively.
  • Washable & Reusable: Designed to last the lifetime of your vehicle, saving you money.
  • Easy Drop-in Installation: Replaces your factory air filter directly with no modifications.
  • Vehicle Specific Fitment:
    • 2008-2013 Audi R8 4.2L V8
    • 2013-2014 Porsche Boxster (Base, S)
    • 2014 Porsche Cayman (Base, S)

Invest in the K&N E-0668 air filter to protect your engine and enhance its performance. Enjoy K&N's 10-Year/Million Mile Limited Warranty and feel the difference with GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008-2012 Audi R8 Base
2011-2012 Audi R8 Spyder
2014-2015 Audi R8 Base
2014-2015 Audi R8 Spyder
2013-2014 Porsche Boxster Base
2013-2014 Porsche Boxster S
2014 Porsche Cayman Base
2014 Porsche Cayman S

Product Details

Product Description

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N E-0668 High-Flow Replacement Air Filter — Unleash Your Vehicle's Potential

Experience a significant boost in performance with the K&N E-0668 High-Flow Replacement Air Filter. Specifically engineered for the 2008-2013 Audi R8 4.2L V8, as well as various Porsche Boxster and Cayman models from 2013-2014, this filter is designed to increase horsepower and acceleration by optimizing airflow to your engine. K&N's legendary washable and reusable cotton gauze media provides superior filtration while allowing for maximum air intake.

Precision Engineered for Performance:

  • Increased Horsepower: Dyno-tested to deliver measurable gains in engine power.
  • Superior Filtration: Advanced layered cotton media captures contaminants effectively.
  • Washable & Reusable: Designed to last the lifetime of your vehicle, saving you money.
  • Easy Drop-in Installation: Replaces your factory air filter directly with no modifications.
  • Vehicle Specific Fitment:
    • 2008-2013 Audi R8 4.2L V8
    • 2013-2014 Porsche Boxster (Base, S)
    • 2014 Porsche Cayman (Base, S)

Invest in the K&N E-0668 air filter to protect your engine and enhance its performance. Enjoy K&N's 10-Year/Million Mile Limited Warranty and feel the difference with GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008-2012 Audi R8 Base
2011-2012 Audi R8 Spyder
2014-2015 Audi R8 Base
2014-2015 Audi R8 Spyder
2013-2014 Porsche Boxster Base
2013-2014 Porsche Boxster S
2014 Porsche Cayman Base
2014 Porsche Cayman S

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