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K & N Custom Air Filter Assembly - RK-3931

  • Part #: 184772
  • Manufacturer Part #: RK-3931

MSRP Price: $262.99

Our Price: $176.04

You Save:
$86.95 (33%)
1 on Hand

Overview of K & N Custom Air Filter Assembly - RK-3931

  • Large-capacity design; 2 1/8 in. tall
  • Boosts performance, service intervals and filtration
  • Designed for Big Inch Performance Motors that require more air
  • Features a K&N High-Flow air filter, a powder-coated billet aluminum backplate that eliminates external breathers, a built-in, dyno-tuned velocity stack and a laser-etched outer cover accent
  • Maintains factory appearance, utilizes stock air cleaner outer cover
  • Filter is pre-oiled

NOTE: For replacement filter use part no: 30-6133

The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.

Specs for K & N Custom Air Filter Assembly - RK-3931

Color - Primary Black
Type Air Cleaner
Units Each
Weight 3.75 lbs

Specs for K & N Custom Air Filter Assembly - RK-3931

Color - Primary Black
Type Air Cleaner
Units Each
Weight 3.75 lbs

Fitment for K & N Custom Air Filter Assembly - RK-3931

See if this part fits your ride

Part 184772 fits the following machines

Harley-Davidson
  • 2017 Harley-Davidson Dyna Fat Bob - FXDF
  • 2016 Harley-Davidson Dyna Fat Bob - FXDF
  • 2015 Harley-Davidson Dyna Fat Bob - FXDF
  • 2014 Harley-Davidson Dyna Fat Bob - FXDF
  • 2013 Harley-Davidson Dyna Fat Bob - FXDF
  • 2012 Harley-Davidson Dyna Fat Bob - FXDF
  • 2011 Harley-Davidson Dyna Fat Bob - FXDF
  • 2010 Harley-Davidson Dyna Fat Bob - FXDF
  • 2009 Harley-Davidson Dyna Fat Bob - FXDF
  • 2008 Harley-Davidson Dyna Fat Bob (EFI) - FXDF
  • 2017 Harley-Davidson Dyna Low Rider - FXDL
  • 2016 Harley-Davidson Dyna Low Rider - FXDL
  • 2015 Harley-Davidson Dyna Low Rider - FXDL
  • 2014 Harley-Davidson Dyna Low Rider - FXDL
  • 2009 Harley-Davidson Dyna Low Rider - FXDL
  • 2008 Harley-Davidson Dyna Low Rider (EFI) -FXDL
  • 2012 Harley-Davidson Dyna Street Bob - FXDB
  • 2011 Harley-Davidson Dyna Street Bob - FXDB
  • 2010 Harley-Davidson Dyna Street Bob - FXDB
  • 2009 Harley-Davidson Dyna Street Bob - FXDB
  • 2008 Harley-Davidson Dyna Street Bob (EFI) - FXDB
  • 2010 Harley-Davidson Dyna Super Glide - FXD
  • 2009 Harley-Davidson Dyna Super Glide - FXD
  • 2008 Harley-Davidson Dyna Super Glide (EFI) - FXD
  • 2014 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2013 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2012 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2011 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2010 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2009 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2008 Harley-Davidson Dyna Super Glide Custom (EFI) - FXDC
  • 2016 Harley-Davidson Dyna Switchback - FLD
  • 2015 Harley-Davidson Dyna Switchback - FLD
  • 2014 Harley-Davidson Dyna Switchback - FLD
  • 2013 Harley-Davidson Dyna Switchback - FLD
  • 2012 Harley-Davidson Dyna Switchback - FLD
  • 2017 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2016 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2015 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2014 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2013 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2012 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2011 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2010 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2008 Harley-Davidson Dyna Wide Glide (EFI) - FXDWG
5.0 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
9
0
0
0
0
Finish
5.0 / 5
Fit
5.0 / 5
Quality
5.0 / 5
Style
5.0 / 5
Value
4.8 / 5
Would you recommend this product?
Yes (1)
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
4 / 5
SIMPLE INSTALL /BEST K&N ASSY YET!
First off got quite a deal through Dennis Kirk using there price match on top of that there shipping time was outstanding (as usuall)

Back to the K&N 3930, install was a breeze, about 1/2 hour but it probably would of been less if I had not to dig up the tools.

I feel that there 3930 is a vast improvement over the earlier HD style Stage 1 air cleaner kits using the round filtyer. This by far is the simplest to install.
April 6, 2010
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Nice Product
I went back and forth between this product and the Big Sucker. Decided to go with the K&N because of the company's history for making a quality product. Install was fast and very easy, instructions were detailed and veru idiot proof. Performance increase is significant. Installed this with a set of Vance and Hines Big Shots and a V & H FuekPak. Runs very nice.
June 18, 2010
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
K&N quality and performance! GREAT!
I have been a dedicated K&N customer since at least 1996, and this product does not disappoint! You get an awesome quality product here, and the reason I bought this was it uses your stock air cleaner cover for a factory look but pulls in MUCH more air. The assembly directions could be a little more clear in the correct location/orientation of the "Spacer" nuts, just make sue you read carefully. Also Do NOT forget to put some BLUE thread-locker on the air cleaner cover bolt (I didn't do this and after about 280 miles it vibrated loose and I ALMOST lost my air cleaner cover).
March 27, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
No Review Title Entered By User
No Review Text Entered By User
June 14, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
No Review Title Entered By User
No Review Text Entered By User
October 22, 2009
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
K&N
Great filter! install was cake, and I love that it keeps the stock cover. would get it again if need be. only thing is READ all the instructions before you even start. great service from dennis kirk as always.
June 27, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
4 / 5
Twin Cam Filter Kit
Pretty easy install, even for a noob like me. Don't forget to check the little flat box under all the items. The backplane is in their and I almost missed it! 8)
April 4, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Can feel power differance
Very fast shipping from Dennis Kirk and great prices, Went with the K and N name and reputation, was not dissapointed, very easy install and stock air dleaner cover fits to look stock, Can feel the differance even before new pipes were installed.
May 18, 2011
Finish
5 / 5
Fit
5 / 5
Quality
5 / 5
Value
5 / 5
Would you recommend this product?
Yes
K&N big sucker with oem breather cover
This has more sq in of air flow / filter than the big sucker . Made the bike a 103 twin cam sound better for sure more power Im unsure but i think better mpg . Kit was easy to install takes a hour taking your time , The only thing that bothered me was where the new velocity stack is there are three rubber holes that mounts it to new back plate they didnt have much material or rubber and I know the screw broke rubber hole and allowed the velocity stack to be some what disformed but dosent effect it so I give it a 10 . You can tell it adds a few ponys , And when you wick it you can hear it sucking air . Reminded me of a old qudrajet carb .
October 28, 2016
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Instructions and Manuals for K & N Custom Air Filter Assembly - RK-3931

Owner's Manual Owner's Manual PDF 134.4 KiB

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