K&N Engineering BM-1821 High-Flow Replacement Air Filter for BMW R 18

K&N® washable, reusable High-Flow Air Filters™ feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's No-Hassle Lifetime Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product. 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: 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).
• Only needs cleaning every 50,000 miles under normal highway driving conditions
• Washable, reusable, and engineered to last for the life of your vehicle
• Designed to provide high airflow and exceptional filtration
• Engineered to fit easily into your factory air box
• No-Hassle Lifetime Limited Warranty
• Emissions legal in all 50 States
• Designed to increase horsepower
• Will not void vehicle warranty

The K&N Engineering BM-1821 High-Flow Air Filter is a washable, reusable replacement air filter designed for select BMW R 18 motorcycles. Its layered, oiled cotton media is engineered to improve airflow while capturing contaminants, helping support increased horsepower, sharper throttle response, and improved acceleration. The filter is designed as a direct replacement for the factory air filter and installs into the original air box without requiring major modifications.

Built for long-term use, the K&N BM-1821 is washable and reusable, reducing the need for repeated disposable filter replacements. Under normal highway driving conditions, it typically requires cleaning only every 50,000 miles. Application-specific sealing beads and custom seals help provide a precise OEM-style fit where applicable, while the durable construction is engineered to last for the life of the vehicle. The filter is backed by K&N's No-Hassle Lifetime Limited Warranty and will not void the vehicle warranty.

This K&N Engineering replacement filter is designed to provide high airflow and effective engine protection for compatible BMW motorcycles. Fitment includes the 2021 BMW R 18, R 18 Classic, and R 18 First Edition; 2022 BMW R 18, R 18 Classic, R 18 B, and R 18 Transcontinental; and 2023 BMW R 18, R 18 B, and R 18 Classic. For filter maintenance, K&N recommends the 99-5000 Filter Care Service Kit Aerosol. This product is emissions legal in all 50 states; California compliance requirements may apply.

What's Included

• One K&N Engineering BM-1821 washable, reusable high-flow air filter

Features:

• High-flow performance: Engineered to improve airflow for increased horsepower, throttle response, and acceleration.
• Washable and reusable: Designed for repeated cleaning and reuse throughout the life of the vehicle.
• OEM-style fit: Application-specific sealing beads and custom seals provide easy installation in the factory air box where applicable.
• Long-term protection: Provides high airflow and exceptional filtration while carrying K&N's No-Hassle Lifetime Limited Warranty.

Fitments:
2021 BMW R 18 Base
2021 BMW R 18 Classic Base
2021 BMW R 18 First Edition Base
2022 BMW R 18 Base
2022 BMW R 18 B Base
2022 BMW R 18 Classic Base
2022 BMW R 18 Transcontinental Base
2023 BMW R 18 Base
2023 BMW R 18 100 Years Base
2023 BMW R 18 B Base
2023 BMW R 18 Classic Base
2023 BMW R 18 Transcontinental Base
2024 BMW R 18 Base
2024 BMW R 18 B Base
2024 BMW R 18 Classic Base
2024 BMW R 18 Roctane Base
2024 BMW R 18 Transcontinental Base
2025 BMW R 18 Base
2025 BMW R 18 B Base
2025 BMW R 18 Classic Base
2025 BMW R 18 Roctane Base
2025 BMW R 18 Transcontinental 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