K&N Engineering SU-4000 High-Flow Air Filter for Suzuki DR-Z400 and Kawasaki KLX400R

The K&N High-Flow Air Filter for Motorcycles is engineered to increase airflow for improved horsepower, throttle response, and acceleration while providing increased engine protection. Built with premium oiled cotton gauze, this washable and reusable air filter is designed for long-lasting performance, a precision OEM-style fit, and durable construction to keep your motorcycle performing ride after ride. The K&N High-Flow Air Filter for Motorcycles is engineered to increase airflow for improved horsepower, throttle response, and acceleration while providing increased engine protection. Associated products: SU-4000PK Air Filter Wrap, 99-5000 Filter Care Service Kit Aerosol

• PRECISION OEM-STYLE FIT: Made with application specific seamless sealing beads and custom seals for easy installation (Where Applicable).
• Designed to provide increased horsepower and acceleration specifically developed for Off-Road, Motocross, ATVs, UTVs and Side by Sides
• Fits directly into OEM air box with application specific sealing bead ensuring a precise fit
• Pleated media provides a large filtration area offering long service intervals
• No fuel management modifications are required to obtain increased performance
• Multiple layers of woven cotton gauze media offers excellent filtration
• Washable & reusable, most are pre-oiled and ready to ride
• One Year Limited Warranty

The K&N Engineering SU-4000 High-Flow Air Filter is designed to improve airflow to the engine for stronger horsepower, sharper throttle response, and improved acceleration. Developed for powersports applications, this replacement filter fits directly into the factory air box and uses an application-specific sealing bead for a precise OEM-style fit.

Constructed with multiple layers of premium oiled cotton gauze, the K&N SU-4000 provides efficient filtration while offering a large pleated media area for extended service intervals. The washable and reusable design supports long-term performance and reduces the need for frequent filter replacement. Most filters arrive pre-oiled and ready to install, and no fuel-management modifications are required to obtain the intended performance benefits.

• Feature: Designed to increase airflow, horsepower, throttle response, and acceleration.
• Feature: Fits directly into the OEM air box with application-specific sealing beads and custom seals where applicable.
• Feature: Multiple layers of woven cotton gauze media provide effective engine air filtration.
• Feature: Washable and reusable construction supports long service life and includes a one-year limited warranty.

Specifications and Technical Data:

• Product Type: High-flow replacement motorcycle air filter
• Brand: K&N Engineering
• Part Number: SU-4000
• Application: Powersports, off-road, motocross, ATV, UTV, and side-by-side use
• Filter Media: Oiled cotton gauze
• Installation: Direct replacement for the factory air filter
• Service Design: Washable and reusable
• Fuel Management: No modifications required for increased performance

What's Included: One K&N Engineering SU-4000 high-flow air filter. Associated products include the SU-4000PK air filter wrap and 99-5000 filter care service kit aerosol.

Fitment: Fits 2000-2002 Suzuki DR-Z400, 2000-2002 Suzuki DR-Z400E, 2000-2002 Suzuki DR-Z400S, and 2003 Kawasaki KLX400R. This product is not CARB approved; applicable emissions requirements should be verified before installation.

Features:

• Increases airflow to support improved horsepower, throttle response, and acceleration
• Direct OEM-style replacement fits the factory air box with application-specific sealing beads
• Multiple layers of oiled cotton gauze provide effective filtration and extended service intervals
• Washable and reusable design includes a one-year limited warranty

Fitments:
2000 Suzuki DR-Z400 Base
2000 Suzuki DR-Z400E Base
2000 Suzuki DR-Z400S Base
2001 Suzuki DR-Z400 Base
2001 Suzuki DR-Z400E Base
2001 Suzuki DR-Z400S Base
2002 Suzuki DR-Z400 Base
2002 Suzuki DR-Z400E Base
2002 Suzuki DR-Z400S Base
2003 Kawasaki KLX400R Base
2003 Kawasaki KLX400SR Base
2003 Suzuki DR-Z400 Base
2003 Suzuki DR-Z400E Base
2003 Suzuki DR-Z400S Base
2004 Suzuki DR-Z400 Base
2004 Suzuki DR-Z400E Base
2004 Suzuki DR-Z400S Base
2005 Suzuki DR-Z400 Base
2005 Suzuki DR-Z400E Base
2005 Suzuki DR-Z400S Base
2005 Suzuki DR-Z400SM Base
2006 Suzuki DR-Z400 Base
2006 Suzuki DR-Z400E Base
2006 Suzuki DR-Z400S Base
2006 Suzuki DR-Z400SM Base
2007 Suzuki DR-Z400 Base
2007 Suzuki DR-Z400E Base
2007 Suzuki DR-Z400S Base
2007 Suzuki DR-Z400SM Base
2008 Suzuki DR-Z400 Base
2008 Suzuki DR-Z400E Base
2008 Suzuki DR-Z400S Base
2008 Suzuki DR-Z400SM Base
2009 Suzuki DR-Z400 Base
2009 Suzuki DR-Z400E Base
2009 Suzuki DR-Z400S Base
2009 Suzuki DR-Z400SM Base
2010 Suzuki DR-Z400 Base
2010 Suzuki DR-Z400E Base
2010 Suzuki DR-Z400S Base
2010 Suzuki DR-Z400SM Base
2011 Suzuki DR-Z400 Base
2011 Suzuki DR-Z400E Base
2011 Suzuki DR-Z400S Base
2012 Suzuki DR-Z400 Base
2012 Suzuki DR-Z400E Base
2012 Suzuki DR-Z400S Base
2013 Suzuki DR-Z400 Base
2013 Suzuki DR-Z400E Base
2013 Suzuki DR-Z400S Base
2013 Suzuki DR-Z400SM Base
2014 Suzuki DR-Z400 Base
2014 Suzuki DR-Z400E Base
2014 Suzuki DR-Z400S Base
2014 Suzuki DR-Z400SM Base
2015 Suzuki DR-Z400 Base
2015 Suzuki DR-Z400E Base
2015 Suzuki DR-Z400S Base
2015 Suzuki DR-Z400SM Base
2016 Suzuki DR-Z400 Base
2016 Suzuki DR-Z400E Base
2016 Suzuki DR-Z400S Base
2016 Suzuki DR-Z400SM Base
2017 Suzuki DR-Z400S Base
2017 Suzuki DR-Z400SM Base
2018 Suzuki DR-Z400S Base
2018 Suzuki DR-Z400SM Base
2019 Suzuki DR-Z400S Base
2019 Suzuki DR-Z400SM Base
2020 Suzuki DR-Z400S Base
2020 Suzuki DR-Z400SM Base
2021 Suzuki DR-Z400S Base
2021 Suzuki DR-Z400SM Base
2022 Suzuki DR-Z400S Base
2022 Suzuki DR-Z400SM Base
2023 Suzuki DR-Z400S Base
2023 Suzuki DR-Z400SM Base
2024 Suzuki DR-Z400S Base
2024 Suzuki DR-Z400SM Base

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: powersports
Epa: N/A
Regular Stock: t
Units Per Sku: 1