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K&N RK Series Air Filter Kit

17 Reviews

This product fits a variety of motorcycles. Please select yours so we can find the right part and guarantee fitment. Select A Motorcycle

  • K&N RK Series Air Filter Kit
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$191.69 Save 10%! Regularly: $212.99

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17 Reviews

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Description for K&N RK Series Air Filter Kit 

K&N RK Series Air Filter Kit

• Guaranteed to increase horsepower

• Custom oversized backing plate provides solid mounting surface

• Dyno-tuned velocity stack directs airflow to engine

• Built-in breathers replace external OE breathers

• Oversized K&N high-flow air filter that is designed to boost performance, filtration and service intervals

• 10-year/million mile limited warranty

Made In The USA This product was proudly made in the USA

Important Product Notes

Product Specs

Manufacturer Part Number: RK-3942

Sold in Units: Each

Fitment for K&N RK Series Air Filter Kit 

This product fits a variety of motorcycles. Please select yours so we can find the right part and guarantee fitment. Select A Motorcycle

Click (+) to view all compatible models

Harley-Davidson® Models

Softail Breakout FXSB : 2013–2015
Softail Deluxe FLSTN : 2013–2015
Softail Fat Boy Anniversary FLSTF : 2013
Softail Fat Boy FLSTF : 2013–2015
Softail Fat Boy Lo Anniversary FLSTFB : 2013
Softail Fat Boy Lo FLSTFB : 2013–2015
Softail Heritage Classic Anniversary FLSTC : 2013
Softail Heritage Classic FLSTC : 2013–2015

Customer Reviews for K&N RK Series Air Filter Kit 

Overall Rating:
5/5 based on 17 ratings

5 by

The K&N Air Cleaner was very straightforward to install, and was complete. It is unobtrusive on the FXDX and works well.

5 by

The K&N filter assembly installed easily using the simple to follow instructions. The filter lets the engine breath easier giving it better throttle responce and it retains the stock look.

5 by

Easy to install and makes the bike look better and also increases performance. Great Product.

5 by

The K&N high flow air cleaner was easy to install and significantly improved the air intake and performance. The size of the air filter did not extend further than the original equipmet air cleaner. The installation instructions were accurate and easy to follow. I am glad that I chose the K&N air cleaner.

5 by

Easy installation, a must for any V&H pipe and FuelPak.

4 by

Fairly easy to install.Noticeable horsepower increase and throttle responce.

5 by

pechased the K/N filter assembly for my 2006 Road King Harley. It is every thing thaty I have read about. Installed easy, fits nice, retains the stock look. Performance and workmanship is top shelf I would recomend this product to all.

3 by

Beauty ring listed in catalog was missing

5 by

Works as advertised.

4 by

Straight forward installation. Good instructions. Think the design could be better. Improved throttle response. Happy with the purchase. Have K&N in all vehicles.

4 by

Very happy with this purchase easy to install took 20 minutes tops. Sounds good and noticeable increase in power.

5 by

Works great, easy to install.

5 by

Easy install. Was able to use stock air filter cover.

5 by

Easy install, and could tell a difference! I'd recommend this, if you want to still keep the "stock" look.

4 by

You need to have the stock throttle body support bracket still attached to be able to install this kit.

5 by

Super easy install. I like being able to use my stock breather cover. Keeps the water out and nobody knows what you have. I added a super tuner to take better advantage of kit

5 by

really impressed with this kit. Awesome fit and makes bike run alot better. Make sure to get some stock breather bolts if you have any other kind of filter installed.

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Due to state regulations we cannot ship this item to the state of California.

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