K&N HD-0818 High Flow Air Filter - Harley-Davidson Touring & Softail
About K&N
K&N pioneered the washable, reusable cotton-gauze air filter and has been building intake products since 1969. On a V-twin, an intake swap is usually step one of the classic uncork — filter, exhaust, then tune.
Give your V-twin the air it craves with the K&N HD-0818 High Flow Air Filter. This filter is engineered with advanced pleated cotton-gauze media to deliver a significant increase in airflow to your engine, all while maintaining excellent filtration.
Why riders pick this
- Increases engine airflow for better performance
- Multi-layer pleated cotton-gauze construction
- Washable and reusable for extended use
- Pre-oiled for quick, hassle-free installation
- Direct replacement for OEM air filter
The K&N HD-0818 High Flow Air Filter is a premium upgrade designed to optimize your Harley-Davidson's intake system. By allowing more air into the engine, it helps improve combustion efficiency, which can translate to better throttle response and a more lively feel on the road. It's a foundational performance upgrade that integrates seamlessly with your bike's existing setup.
Optimized Airflow and Engine Protection
- Pleated cotton-gauze media maximizes filtration surface area
- Multi-layer woven construction for superior particle capture
- Washable and reusable design reduces long-term maintenance costs
- Pre-oiled and ready to install right out of the box
- Application-specific sealing bead ensures a perfect fit in the OEM airbox
Effortless Performance Enhancement
Designed for a direct fit into your OEM airbox, the K&N HD-0818 High Flow Air Filter makes upgrading your Harley-Davidson simple. There's no need for complicated fuel management changes in most stock applications, making it a true bolt-on performance part. Riders looking for a quick and effective way to improve their bike's breathing will find this filter an excellent choice, whether it's for a Road King or a Softail Slim S.
Specifications
- Brand: K&N
- Manufacturer Part #: HD-0818
- UPC: 024844200549
- Length: 6.31 in
- Width: 6.56 in
- Height: 3.5 in
- Weight: 1.8 lbs
Common questions
Do I need to retune my fuel management with this filter?
No, K&N designed this filter to deliver increased airflow without requiring fuel mapping changes in most stock applications.
How often should I clean this air filter?
Inspect your filter regularly. Clean and re-oil it when visibly dirty, typically every 50,000 miles under normal driving conditions, or more frequently in dusty environments.
Is this filter compatible with my Harley-Davidson Touring or Softail?
This filter fits various Harley-Davidson Touring and Softail models. Please check our Shop by Bike tool to verify exact compatibility for your specific motorcycle before purchasing.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | K&N |
| TYPE | Air Filters |
| SKU | 720818 |
| WEIGHT | 1.8 lb |
