K&N RK-3902PK

Filter Wraps > Air Filter Wrap
List Price: $27.75
Your Price: USD $21.99

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The K&N PreCharger® filter wrap is specially designed to extend the service interval of your K&N Filtercharger filter when used in very dusty conditions. They are made from durable polyester material containing a uniform weave. The PreCharger will stop small dirt particles with minimal restriction to the airflow of the filter.

[More Information on PreCharger Filter Wraps]
  • This product wraps your air filter with an additional pre-filter
  • Extends service interval of your K&N filter in dusty conditions
  • Durable polyester material with stitched elastic openings
  • Cleanable with K&N Filter Cleaner

Available Information

Product Specifications

Air Filter ShapeOval
Closed TopNo
Height1.5 in (38 mm)
Inside Length7 in (178 mm)
Inside Width4.5 in (114 mm)
Material UsedPolyester
Package Contents1 PreCharger Wrap
Package Quantity1
Product Box Height1.5 in (38 mm)
Product Box Length5.25 in (133 mm)
Product Box Width6.25 in (159 mm)
Product StyleFilter Wrap - Oval Straight
Weight0 lb (0 kg)
Wrap TypePrecharger

Customer Feedback

Be the first to review part RK-3902PK
Dear sirs:

All I can say is most people won't believe this but then it's their miles per gallon that is. I Own 2 Harleys, a 1979 HD Sportster that several years ago I put a K&N air filter on and felt like it doubled it's performance, and a 1999 FLSTF Fat Boy. I didn't rest there, as a year ago I put a K&N on my 2001 Dodge Ram Quad cab Cummins turbo diesel and also felt the increase in performance not to mention the scream of that turbo that I had never really heard from the factory.

Recently two of my buddies and I went on a motorcycle trip to Stecoah, N.C. Before going on the trip I changed all my fluids and serviced the whole bike. I decided to buy a K&N air filter and pitch the stock one. They were riding a 2003 Honda Goldwing, a 2005 Harley Davidson Roadking and I took my 99 Fat Boy. Prior to installing the K&N my Fat Boy got between 40 & 43 MPG. As we went from fuel stop to fuel stop my mileage was as follows: 43 MPG, 47 MPG, 46 MPG, 48 MPG and 52 MPG EVERY tank after that. My buddies only mustered 44 -46 MPG. Most people would ask what about the weight and the speed. Well both my saddle bags were packed, I had a bag with 20 lbs. on my luggage rack, plus my TBags weighed in at about 50 lbs. The weight we carried was all about the same. The motorcycle weights were different, but not enough to warrant the major difference in MPG. Also mine is carbureted and theirs are fuel injected. As far as the speeds, we were cruising on the interstate at 70 to 80 MPH through a whole fuel run which was about 200 miles. Even when I was on the tail of the dragon, which is 318 turns in 11 miles, my mileage stayed at 52 MPG. All I can say is after over 1700 miles on that trip the K&N definitely paid for itself with the increase of 9-12 MPG.

So everyone has a choice. you can pay at the pumps or spend that money on the LAST air filter you will EVER buy.

Ronnie E.
Glen Rock, Pennsylvania
Noticed right away that car had more power. Increased fuel mileage almost two and a half mpg. I always replace the stock filter with a K&N. I have 2 Pickups and 3 cars and a Harley Davidson Street Glide all have K&N filters.

Terry Hagg
Wheatland, La
This filter designed spared me the trouble of using the Harley Davidson stock replacement kit or the expensive naked filter assembly. I have hi-flow performance concealed in the original housing. My bike is a very new production model with limited after market products available, so Thanks K&N. Harley Davidson Street 750 owner.

Brother Andy