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K&N Replacement Air Filter SU-4000 for Suzuki DR-Z400 (2000-2022) & Kawasaki KLX400R (2003)
$68.99

If you're hitting the trails or tearing up the dirt, you know how crucial it is to keep your ride breathing right. That’s where the K&N off-road replacement air filter comes into play. Designed for those of us who live for the thrill of off-road adventures, this filter is built to handle the grime and grit that comes with extended use in dusty conditions. Trust me, it keeps your carburetion clean even when you're climbing to those high altitudes where other filters might struggle.

One of the best parts? You typically won’t need to mess with jet changes when you swap in a K&N filter element—just pop it in and go. This air filter is all about high airflow and excellent filtration, which means you get more power without sacrificing performance. Plus, it’s washable and reusable, so you’re not constantly shelling out cash for replacements.

  • Color: It’s a striking red, so it’ll stand out in your engine bay.
  • Dimensions: The large end diameter is 6.313 inches (160 mm), with a base inside diameter of 5.125 inches (130 mm), and a height of 3 inches (76 mm). It’s a tapered conical shape that fits snugly in your setup.
  • Material: Made from cotton gauze, it’s flexible and durable, ready to take on whatever you throw at it.
  • Weight: Weighing in at just 1.1 lbs (0.5 kg), it won’t weigh you down.

When it comes to maintenance, you’ll need about 0.64 oz (19 ml) of oil for re-oiling. K&N even throws in a 1 oz tube of sealing grease to make your life easier. And don’t worry about packaging—this filter comes in a sturdy paperboard box, so it arrives in one piece.

Now, let’s talk fitment. This filter is compatible with a bunch of models, including:

  • Kawasaki KLX400R (2003)
  • Kawasaki KLX400SR (2003)
  • Suzuki DR-Z400 (2000-2017)
  • Suzuki DR-Z400E (2000-2018)
  • Suzuki DR-Z400S (2000-2022)
  • Suzuki DR-Z400SM (2005-2022)

So if you’re looking to boost your bike's performance while keeping it clean and efficient, this K&N air filter is a solid choice. It’s backed by a 1-year limited warranty, which gives you peace of mind as you tackle those rugged trails.

Need help with installation? You can find the instructions right here.

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WARNING: Cancer and Reproductive Harm
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Vehicle Make/Model
Kawasaki KLX400R 2003 Base
Kawasaki KLX400SR 2003 Base
Suzuki DR-Z400 2000-2004 Base
Suzuki DR-Z400E 2000-2008 Base
Suzuki DR-Z400S 2000-2023 Base
Suzuki DR-Z400SM 2005-2010, 2013-2023 Base

K&N Logo

Who is Behind K&N Intakes?

K&N, formally known as K&N Engineering, Inc., is the world’s leading manufacturer of washable performance air filters and cold air intake systems. K&N manufactures over 12,000 parts for a wide range of makes and models of motorcycles, cars, SUV, trucks, industrial applications, and more. K&N was founded in 1969 and is headquartered in Riverside, California in a complex of 10 buildings compromising approximately 400,000 square feet. K&N also operates facilities in China, England, and the Netherlands.

In the early 1960s, two motorcycle racers, Ken Johnson and Norm McDonald (K&N) developed a revolutionary idea for an air filter—one that could perform under the demands of dusty, dirty off-road environments. After experimenting with different types of filter media, they discovered that an oiled cotton design allowed the filter to capture contaminants efficiently, and also be washed and reused. It was right then and there that the original K&N High-Flow Air Filter was born. Fifty years later, K&N is still dominating the industry with leading filtration technology and innovative products that offer extraordinary protection for virtually every application out there.

What Makes K&N the Best?

All K&N products undergo rigorous testing to make sure they adhere to and exceed demanding quality standards. These tests include power, torque, and airflow tests to confirm that the intake products are maximizing power boost while retaining engine safety. The company stands behind its product 100 percent with some of the most extensive warranties in the business – a Million Mile Limited warranty. K&N’s performance air intake systems are designed to improve airflow to the engine by replacing the restrictive factory system with a single aerodynamic tube and highly efficient filter media. The systems are available in two materials. The first is Polyethylene, which is used to produce 57 and 63 series intake systems. The second one is aluminum, which can be found on the 69 and 77 series intake systems.

Advantages of K&N Intakes

The benefits of adding a K&N intake system to your car are plenty. Firstly, it will increase your vehicle’s horsepower and torque, while also improving fuel economy and the appearance of your engine bay. What’s more, it will deliver a satisfying, more aggressive exhaust note at higher RPMs. Each K&N intake includes an oversized filtering unit, which can go up to 100,000 miles between cleanings, unlike paper filters that can become clogged easily and cannot be washed or reused. In other words, with K&N products, you will never have to replace your air filter again.

Why Install an Aftermarket Intake?

Internal combustion engines all work as large air pumps. Air goes in, fuel is added, combustion occurs, and air goes out. This means there are two ways of increasing power: getting more air into the engine or making it easier for air to get out of the engine. Your air intake is responsible for filtering air before it enters your engine. Dirty air can damage the engine cylinder walls, so a high-quality filter is a must-have item. With a K&N system or filter, you increase airflow through the filter, which means more air is pulled into the engine. K&N does this without reducing filtration qualities, so your engine will live a long life.

Purchase K&N Intakes at Vivid Racing

Vivid Racing carries an extensive inventory of K&N products ranging from air filters, oil filters, air injection systems, fuel filters and pumps, sensors, carburetors, cold air intakes, and much, much more! If you cannot find a particular item above, please call us at (480) 966-3040 and we will help you find it. We are also here to answer any product questions, regarding usage, benefits, and fitment. Don’t delay! Improve your vehicle’s performance today with K&N Intakes.   

K&N Oil Filters | K&N Replacement Filters | K&N 57 Series Intakes | K&N 69 Series Typhoon Intakes
K&N 77 Series Intakes

K&N 10-YEAR/ MILLION MILE LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N OE Replacement Air Filter and Intake System (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for 10-Years or a Million Miles, whichever comes first, from the date the product was purchased. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

K&N 3-YEAR/ 300,000 MILE LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N Commercial Grade Diesel Air Filter (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for 3-Year or 300,000 miles, whichever comes first, from the date the product was purchased. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

K&N ONE YEAR LIMITED WARRANTY
This warranty covers defects in materials and workmanship of your K&N Oil Filter, Automotive Accessory, Universal, Special or Disposable Filter, Exhaust Systems (the "Product"), with the exceptions stated below.
This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use or (j) external causes such as accidents, abuse, or other actions or events beyond our reasonable control (e.g., acts of God and natural disasters).
This warranty lasts for One Year from the date of purchase. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if we repair or replace the Product.
We will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection.

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