K&N Engineering

K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 Height - E-3988

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SKU:
KNNE-3988
UPC:
024844366818
MPN:
E-3988
Availability:
Regularly stocked product
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$68.99
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Description

Do K&N Air Filters fit specific Harley-Davidson motorcycles?
K&N Custom Air Filters are specifically designed as replacement air filters for select K&N RK Series air cleaner assemblies for Harley-Davidson motorcycles.

Can K&N Air Filters increase horsepower?
This K&N Custom Air Filter is engineered to increase horsepower and acceleration for a more responsive motorcycle ride.

The K&N Custom Air Filter is designed for specific Harley-Davidson motorcycles, promising an 8/8 score for Street Performance. Its washable and reusable construction ensures long-term value and superior engine protection through excellent filtration. Trust K&N Engineering for a direct-fit upgrade that enhances your motorcycle's power and acceleration with confidence.

Key Features

  • increase horsepower and acceleration
  • excellent filtration
  • washable and reusable
  • replacement air filter for specific K&N RK Series air cleaner assemblies for Harley-Davidson motorcycles
  • covered by the famous K&N Million-Mile Limited Warranty

Why Choose the KN Custom Air Filter

Delivers exhilarating horsepower and quicker acceleration for a more responsive ride.

Achieves superior engine protection with advanced filtration, keeping your engine cleaner.

Provides long-term value and sustainability by being easily washable and reusable.

Transforms your Harley-Davidson's performance with a direct-fit upgrade for RK Series assemblies.

Who Is This For?

Street Performance — 8/10
Increases horsepower and acceleration for street use.

Engine Performance — 9/10
Directly claims to increase horsepower and acceleration.

Racing Competition — 7/10
Performance gains support racing competition needs.

Easy DIY Install — 8/10
Drop-in install type simplifies installation process.

Track / Autocross — 7/10
Performance gains benefit track and autocross events.

Visual / Aesthetic Upgrade — 5/10
Premium performance position suggests aesthetic appeal.

Frequently Asked Questions

Will a K&N Custom Air Filter fit my Harley-Davidson?

Confirming fitment with your specific vehicle is essential for optimal integration. This K&N Custom Air Filter is designed as a drop-in replacement for specific K&N RK Series air cleaner assemblies, ensuring a precise match for those applications. Trust in K&N's meticulous engineering for guaranteed compatibility with your designated RK Series setup.

How difficult is it to install a K&N Custom Air Filter?

Installation is straightforward with a drop-in design, making it an easy DIY process. This filter is engineered for a seamless integration, mirroring the ease of a standard replacement part. Enjoy a quick and effective upgrade to your motorcycle's performance with minimal effort.

Can a K&N Custom Air Filter improve my motorcycle's performance?

Experience exhilarating horsepower and quicker acceleration with a score of 9 for Engine Performance. This filter directly contributes to enhanced power output for a more responsive ride. Achieve a noticeable performance uplift designed for demanding motorcycle use.

What is the warranty on a K&N Custom Air Filter?

This K&N Custom Air Filter is protected by the famous K&N Million-Mile Limited Warranty, offering unparalleled long-term confidence. This extensive warranty underscores the product's exceptional durability and reliable performance. Ride with peace of mind knowing your investment is covered for the long haul.

Additional Resources

Official K&N Engineering Product Page

Important Notices

⚠️ Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

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Additional Information

Clearance Item:
N
MPN:
E-3988
Proposition 65:
Y
Case Lot Quantity:
1
Category:
Air Filters>Air Filters - Direct Fit
Universal Fitment:
Y
Install Type:
Drop-In
Product Level:
Premium Performance
Street Performance:
8/10
Engine Performance:
9/10
Racing Competition:
7/10
Easy DIY Install:
8/10
Track / Autocross:
7/10
Visual / Aesthetic Upgrade:
5/10
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