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 the vehicle, and backed by K&N's No-Hassle Lifetime Limited Warranty. K&N drop-in replacement filters are designed to install easily into the factory air box.
Specifications:
- Product type: Drop-In Air Filter
- Style: Panel Air Filter
- Shape: Panel
- Media: Cotton Gauze
- Washable and reusable: Yes
- Height: 0.844 in (21 mm)
- Outside length: 8.938 in (227 mm)
- Outside width: 4.938 in (125 mm)
- Re-oil amount: 0.42 oz (12 ml)
- Package contents: 1 Air Filter
- Warranty: No-Hassle Lifetime Limited
- Part number: BM-1821
Vehicle Applications:
- 2026 BMW R18 1802
- 2026 BMW R18 B 1802
- 2026 BMW R18 Classic 1802
- 2026 BMW R18 Roctane 1802
- 2026 BMW R18 Transcontinental 1802
- 2025 BMW R18 1802
- 2025 BMW R18 B 1802
- 2025 BMW R18 Classic 1802
- 2025 BMW R18 Roctane 1802
- 2025 BMW R18 Transcontinental 1802
- 2024 BMW R18 100 Years 1802
- 2024 BMW R18 1802
- 2024 BMW R18 B 1802
- 2024 BMW R18 Classic 1802
- 2024 BMW R18 Roctane 1802
- 2024 BMW R18 Transcontinental 1802
- 2023 BMW R18 100 Years 1802
- 2023 BMW R18 1802
- 2023 BMW R18 B 1802
- 2023 BMW R18 Classic 1802
- 2023 BMW R18 Roctane 1802
- 2023 BMW R18 Transcontinental 1802
- 2022 BMW R18 1802
- 2022 BMW R18 B 1802
- 2022 BMW R18 Classic 1802
- 2022 BMW R18 Classic First Edition 1802
- 2022 BMW R18 First Edition 1802
- 2022 BMW R18 Transcontinental 1802
- 2022 BMW R18 Transcontinental First Edition 1802
- 2021 BMW R18 1802
- 2021 BMW R18 Classic 1802
- 2021 BMW R18 First Edition 1802
- 2020 BMW R18 1802
- 2020 BMW R18 Classic 1802
FAQ
What does the K&N BM-1821 fit?
It fits 2020-2026 BMW R18. Check your exact year, make, model and engine against the vehicle application list before ordering.
Is the K&N BM-1821 washable and reusable?
Yes. The K&N media is washable and reusable; clean and re-oil it with a K&N Recharger kit instead of replacing it.
What warranty does it carry?
It is backed by the K&N No-Hassle Lifetime Limited Warranty.
