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  3. HARLEY RK3904

HARLEY Intake Filter Kit RK-3904

fits model: Sportster. make: Harley, Davidson.

Rk-3904 K & N Rk3904 K&n Intake System For Harley Davidson Sportster Filter Kit Bin Or Best O

( Brand: Harley ), ( Manufacturer Part Number: RK3904 ), ( Part Type: Intake Filter )

Review HARLEY Intake System Davidson Filter Kit Bin Or Best fits SPORTSTER

The RK-3904 Intake Filter Kit by RK Technologies is an excellent upgrade for Harley-Davidson Sportster riders seeking to enhance their motorcycle's performance and air filtration system. This intake kit is specifically designed for the Sportster XL 1200 model and replaces the stock airbox and filter element.

The heart of this kit is the high-flow air filter, which boasts a large surface area for increased airflow and improved engine performance. The filter is made from cotton gauze, ensuring a tight weave that traps even the smallest particles while allowing a substantial amount of air to pass through. The filter housing is constructed from durable, UV-resistant plastic, and its design allows for easy, tool-less filter removal and replacement.

This intake kit also features a free-flowing intake manifold, which eliminates the restrictive stock airbox and provides a more direct route for air to enter the engine. This unobstructed airflow results in improved throttle response, increased horsepower, and better overall engine performance.

The RK-3904 Intake Filter Kit is not only a performance upgrade but also an aesthetic one. The high-flow air filter sits proudly on display within the custom-designed intake manifold, adding a unique and visually appealing touch to your Harley-Davidson Sportster.

Installation of the kit is straightforward and can be completed in about an hour with common hand tools. RK Technologies provides detailed instructions, and the kit includes all necessary hardware for a hassle-free installation process.

In summary, the RK-3904 Intake Filter Kit by RK Technologies is a must-have upgrade for Harley-Davidson Sportster riders who desire better engine performance, improved air filtration, and a unique appearance. This kit is a direct replacement for the stock airbox and filter element on the XL 1200 model and is easy to install with the included instructions and hardware.

Pros and Cons of Buying an RK3904 Intake for Harley Davidson Sportster: Filter Kit RK-3904-BIN

An aftermarket intake system is an excellent modification for Harley Davidson Sportster riders looking to enhance engine performance. One such intake system is the RK3904 from Rinehart Racing. In this article, we will discuss the pros and cons of buying this intake system.

Pros:

1. Enhanced Airflow: The RK3904 intake system provides a more significant airflow to the engine, which results in improved horsepower and torque.

2. Better Filtration: The intake system comes with a high-performance air filter that ensures better filtration of the incoming air, leading to better engine protection and longevity.

3. Improved Engine Sound: The RK3904 intake system offers a unique and distinctive engine sound, making your Harley Davidson Sportster stand out from the crowd.

4. Easy Installation: The intake system is relatively easy to install, making it a popular choice among Harley Davidson Sportster owners.

5. Durability: The RK3904 intake system is made of high-quality materials and is designed to last, ensuring that you get a good return on your investment.

Cons:

1. Higher Cost: The RK3904 intake system is more expensive than the stock intake, which may be a deterrent for some riders.

2. Maintenance: The high-performance air filter may require more frequent cleaning or replacement than the stock filter.

3. Potential Noise: The intake system may produce more noise than the stock intake, which may not be desirable for all riders.

4. Not Suitable for All Sportster Models: The RK3904 intake system may not be suitable for all Harley Davidson Sportster models, so it is essential to check compatibility before making a purchase.

Conclusion:

The RK3904 intake system from Rinehart Racing is an excellent modification for Harley Davidson Sportster riders looking to enhance engine performance. The intake system offers several benefits, including improved airflow, better filtration, and a unique engine sound. However, it also comes with some drawbacks, such as a higher cost, potential noise, and maintenance requirements. Ultimately, the decision to buy the RK3904 intake system depends on your personal preferences and riding style. If you are looking for a significant performance upgrade and don't mind the additional cost and maintenance, then this intake system is an excellent choice for your Harley Davidson Sportster.

Details:

OR BEST OFFER ON A USED K N RK-3904 CHROME AIR CLEANER HARLEY DAVIDSON XLH1200 SPORTSTER 91-96, SEE PICTURES ASK ANY QUESTIONS OTHER LISTINGS FOR MORE NOS OEM FORD PARTS AND USA TOOLS 91-96.

part #: rk3904 price

  • $99.99

specifications aicleaer:

  • for models: Sportster
  • for makes: Harley, Davidson
  • brand: Harley
  • mpn: Rk3904
  • part type: Intake Filter

offer aicleaer:

  • started: July 28, 2025
  • sold: 0
  • options: Ship-to-home
  • quantity: 1
  • best offers: True
  • availability: In Stock

shipping aicleaer:

  • class: Expedited
  • carrier: USPS
  • cost: $9.45
  • transit: 3-9 Days
  • service: USPS Priority Mail
  • type: Fixed

returns aicleaer:

  • policy: No Returns

general aicleaer:

  • Car Truck Parts Accessories > Air Fuel Delivery > Air Filter Housings
  • condition: Used

payments aicleaer:

  • credit card: Discover
  • wallet: Apple-pay
  • other

seller aicleaer:

  • city: Camby, Indiana
  • rating: 99.6%
  • # reviews: 4116
for models: sportster, for makes: harley, davidson, part type: intake filter,
category: auto parts > car truck parts accessories > air fuel delivery > air filter housings, sku: 12556719420198622,
Harley RK3904 Is Similar To:
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1 offer $99.99 USD
  • Used. Offer #1 priced at $99.99 + $9.45 shipping estimate = $109.44* total. XLH1200 SPORTSTER 91-96.+$9.45 shipping

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