Pay in installments of $33.50 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 14 - Aug 19
For Your Every Summer RSVP, with Code: SUMMER15
Description
K&N Intake System-Harley Davidson (RK-3947X)K&N's Street Metal Series High Flow Air Intake Systems provide attractive styling, offer increased airflow and deliver more horsepower & torque to your Harley Davidson motorcycle. This series completely eliminates the stock OE air cleaner and replaces it with a high flow K&N air intake system, increasing power. This intake system uses an extra tall K&N air filter, which means even more air flow and longer service intervals than standard RK series air
K&N's Street Metal Series High-Flow Air Intake Systems provide attractive styling, offer increased airflow and deliver more horsepower & torque to your Harley-Davidson motorcycle. This series completely eliminates the stock OE air cleaner and replaces it with a high-flow K&N air intake system, increasing power. This intake system uses an extra tall K&N air filter, which means even more air flow and longer service intervals than standard RK-series air intake filters. Larger or custom engine builds most often benefit from higher levels of air flow, so the extra tall filter designs are a perfect choice for more powerful bikes. The K&N high-flow air filter is washable, reusable, pre-oiled and ready for installation, making an already easy install even faster. Just how fast? Less than 90 minutes, in most cases. The sturdy, custom aluminum backing plate mounts directly to the throttle body via an aluminum integrated, internal-run breather system. A durable mounting gasket is also included to help absorb vibration. The brilliant shine on this custom flare-shaped chrome cover give this air intake makes an impression on and off the road.- Designed for Harley-Davidson motorcycles
- Increase horsepower and torque
- Extra tall air filter design provides even more air flow and longer service intervals than standard RK-series air intakes
- Easy to install
- Made in the U.S.A.
- Backed by K&N Million Mile Limited Warranty
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 14 reviews
Sort
Product Reviews
★★★★★ 5
Great product!
High quality; great product; highly recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 27, 2025
★★★★★ 5
Good product too!!!
Style: CA7440
Great fit!! Good price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
Lexus 2021 ES300h fit
Style: CA12289
Fit 2021 Lexus ES300h perfectly. Seem to be decent quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
★★★★★ 5
Fit was right and works good
Style: CA10755
It fit my car and seems to be working just fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2026
★★★★★ 5
Will buy again
Style: CA10755
Good fit and good quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026