K&N Engineering
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
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K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)
K&N Engineering

K&N Universal Custom Oval Air Filter — 9.313in OD x 2.375in H High-Flow (RK Series Replacement)

SKU: KNNE-3988

About K&N Engineering K&N has been the world's leader in ...Read more

Price:
$68.99
680 ENTRIES10X
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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

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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-3988 Universal Custom Oval High-Flow Air Filter

Upgrade your RK Series air cleaner assembly with the K&N E-3988 Universal Custom Oval Air Filter. This high-performance filter is specifically designed to increase horsepower and acceleration, providing superior airflow while maintaining excellent filtration efficiency. With a 9.313-inch outer diameter and 2.375-inch height, it's an ideal replacement for specific K&N RK Series units, particularly for Harley-Davidson motorcycles.

Designed for Performance and Longevity

  • Optimized Airflow: K&N's renowned layered, oiled cotton media maximizes air intake for improved engine response and power.
  • Engine Protection: Effectively captures harmful contaminants, ensuring the longevity and health of your engine.
  • Washable & Reusable: This filter offers exceptional long-term value, being fully washable and reusable for the life of your vehicle.
  • Million-Mile Warranty: Backed by K&N's famous Million-Mile Limited Warranty, guaranteeing quality and durability.

Whether you're replacing a worn filter or upgrading for better performance, the K&N E-3988 delivers. Experience the difference of K&N's advanced filtration technology and unleash your engine's potential. Available now at GGCRACING.

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-3988 Universal Custom Oval High-Flow Air Filter

Upgrade your RK Series air cleaner assembly with the K&N E-3988 Universal Custom Oval Air Filter. This high-performance filter is specifically designed to increase horsepower and acceleration, providing superior airflow while maintaining excellent filtration efficiency. With a 9.313-inch outer diameter and 2.375-inch height, it's an ideal replacement for specific K&N RK Series units, particularly for Harley-Davidson motorcycles.

Designed for Performance and Longevity

  • Optimized Airflow: K&N's renowned layered, oiled cotton media maximizes air intake for improved engine response and power.
  • Engine Protection: Effectively captures harmful contaminants, ensuring the longevity and health of your engine.
  • Washable & Reusable: This filter offers exceptional long-term value, being fully washable and reusable for the life of your vehicle.
  • Million-Mile Warranty: Backed by K&N's famous Million-Mile Limited Warranty, guaranteeing quality and durability.

Whether you're replacing a worn filter or upgrading for better performance, the K&N E-3988 delivers. Experience the difference of K&N's advanced filtration technology and unleash your engine's potential. Available now at GGCRACING.

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