K&N 2000-2009 Suzuki DRZ400 Replacement Air Filter

K&N Replacement Air Filter Suzuki DRZ400 (2000–2009) | High-Flow SU-4000

Boost horsepower and throttle response on your 2000–2009 Suzuki DRZ400 with the K&N SU-4000 washable, high-flow replacement air filter. Fast drop-in fit.

Engineered to deliver improved horsepower, acceleration, and superior filtration, the K&N High-Flow Replacement Air Filter (Part # SU-4000) is a direct drop-in upgrade for 2000–2009 Suzuki DRZ400 models (including DR-Z400, DR-Z400E, DR-Z400S, and DR-Z400SM variants). Constructed with multiple layers of oiled cotton gauze media sandwiched between aluminum wire mesh, this tapered conical filter captures dust and particulate contaminants while allowing significantly higher airflow than standard paper filters.

Designed specifically for demanding off-road, dual-sport, and supermoto environments, the SU-4000 maintains clean carburetion even at high altitudes and under heavy load without typically requiring jetting changes on stock engines. Unlike disposable paper filters, this K&N filter is fully washable and reusable, engineered to last the lifetime of your motorcycle with routine servicing using K&N’s filter care kits. Each package includes 1 oz of dedicated air filter sealing grease to ensure a dust-tight airbox seal during rugged rides.

Best Uses

1. Dual-Sport & Off-Road Trail Riding: Ideal for dusty trails and dirt environments where consistent, high-volume airflow and reliable dust capture are required.
2. Supermoto & Street Commuting: Great for daily DR-Z400SM riding to gain crisp throttle response and extra mid-range pull on pavement.
3. High-Altitude Adventure Riding: Maintains smooth fuel-to-air delivery when riding across varying elevations without choking the carburetor.
4. Cost-Conscious Maintenance: Excellent long-term replacement for riders looking to eliminate the expense of continually replacing OEM disposable paper air filters.

Features

1. Multi-Layer Oiled Cotton Gauze: Pleated cotton media bonded between wire mesh provides maximum surface area and efficient filtration.
2. Direct Drop-In Fit: Custom-engineered to fit into the stock airbox without modification.
3. Washable & Reusable Media: Easy to clean, re-oil, and re-install, extending its service life indefinitely.
4. Included Sealing Grease: Comes bundled with a 1 oz tube of K&N sealing grease to eliminate air leakage around the airbox lip.
5. No Jetting Required: Designed to work smoothly with stock jetting configurations under standard setup.

Benefits

1. Increased Airflow & Power: Delivers up to 50% more airflow compared to restrictive paper filters, boosting horsepower and acceleration.
2. Long-Term Savings: Eliminates the ongoing cost of buying factory disposable filters every service interval.
3. Engine Protection: Traps harmful dirt, dust, and micro-particles to safeguard internal cylinder and piston components.
4. Eco-Friendly Choice: Reduces landfill waste by replacing disposable filters with a single lifetime solution.
5. Backed by Warranty: Covered by K&N’s 1-Year Limited Warranty for quality assurance and performance peace of mind.

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