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⚡ Ride Loud, Ride Proud: Power Meets Precision for Your Harley
The K&N Cold Air Intake System RK-3952 is a premium, vehicle-specific upgrade designed for select 2008-2017 Harley Davidson motorcycles. Featuring a dyno-tested high-flow intake tube, custom heat shield, and washable cotton air filter, it guarantees increased horsepower, enhanced throttle response, and a richer engine sound. Built with durable materials and backed by a no-hassle lifetime limited warranty, this system installs in about an hour without voiding factory warranties—perfect for riders who demand performance and reliability.
| ASIN | B07BHB1W8M |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #521,336 in Automotive ( See Top 100 in Automotive ) #1,786 in Powersports Air Filters |
| Brand | K&N |
| Brand Name | K&N |
| Customer Reviews | 4.6 out of 5 stars 228 Reviews |
| Fit Type | Vehicle Specific Fit |
| Global Trade Identification Number | 00024844367013, 02484436701300 |
| Included Components | 1 Air Filter |
| Item Dimensions L x W x H | 12"L x 9.5"W x 3.75"H |
| Item Highlight | Fits Select 2008-2017 HARLEY DAVIDSON: FLSTF Fat Boy/FLSS Softail Slim/FXSB Breakout (See Product Description) |
| Item Type Name | Intake System (Harley Davidson) |
| Item Weight | 3.9 pounds |
| Manufacturer | K&N Engineering |
| Manufacturer Part Number | RK-3952 |
| Manufacturer Warranty Description | 3 Months |
| Model Number | RK-3952 |
| Number of Items | 1 |
| OEM Equivalent Part Number | 77-2557KP |
| OEM Part Number | 77-2557KP |
| Product Dimensions | 12"L x 9.5"W x 3.75"H |
| Product Grade | Performance Part |
| Shape | Oval |
| UPC | 024844367013 |
| Unit Count | 1 Count |
H**R
Worth Every Dime
I replaced an Arlene Ness Big Sucker with this K&N and it was worth every dime. Way more air flow and a significantly noticeable increase in power. Instructions were a little vague but it wasn't that hard to figure out. Looks good and it gives the desired effect.
P**S
Great breather for my Harley Roadglide
Ive tried a few different breathers on my 2015 Harley Road glide and when this was on sale i had to try it. Install was straight forward with clear included instructions. Parts are quality made and thought went into engineering this to fit perfect. Fit touring Harleys really well. This is my favorite to date. Included pictures. Kit comes with a K&N decal and a emission decal/ tag if needed for your state Inspection. Highly recommended.
G**S
Feels solid
Looks good, feels solid, half the price of others, need to get it installed and bike tuned but excited for the future
J**S
Improvement in performance
Definate improvement in performance , cosmetically I would like chrome, but its okay.
L**T
K and N filter assembly
Was reluctant to change screaming eagle assembly but this filter met all expectations. I put bike on dyno and I gained 8.5 horsepower. That's a phenomenal gain! Very impressed!
A**N
Sharp looking & great packaging
Looks great, packaging was done proffessionaly and protective. Has all hardware, even included a small disposable bottle of Loctite. Looks good mounted, not sure about added performance yet. Bike is not flashed and i dont plan to until headers are on to complete my exhaust. Did a quick test run and didn’t recognize much of a difference other than the suck noise from added air flow into intake. Sale description said install was 90min or less which was a bit excessive of a high point. If it takes you 90min you should stick to your desk job, at the most it’s a 15-20min process. That includes gathering a couple tools and a run to the fridge for a beer before removing the first bolt. I am going to go with conspiracy theory that K&N may be in bed with some installers so they can charge 90min shop time? Anyway, good job K&N again.
K**O
Perfect
Pulling a LOT of air, I love it! Don’t forget to tune your ECU to give more fuel or you’ll run hot (lean).
T**M
Performance
A noticeable power difference! On my Ultra Classic definitely money well spent !
B**M
Dont hesitate buy it you wont be disapointed
Increased my harley ultra classics horsepower gices it a little.rumble what more can i say great work K&N .very easy install
O**.
Muy buen producto
Se ve increíble en la. Moto
W**E
AWESOME, CHEAP, EASY
Awesome! Love it, super easy bolt on filter, half the price of Harley priced stage one filters HIGHLY RECOMMEND!!
C**N
Potencia y ahorro de gasolina
Me gustó mucho como se ve , y en cuanto al sonido sonido y la potencia si aumento , en cuanto a la instalación no es tan complicado pero si hay que hacerlo con cuidado , si lo recomiendo
S**Y
Parfait
Fit comme un charme.
Trustpilot
1 day ago
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