K-N FILTERS BM-1821 High Flow Air Filter

( Brand: K-n Filters ), ( Manufacturer Part Number: BM-1821 ), ( Model: HIGH-FLOW ), ( Base Color: Black ), ( Color/finish 2: Red ), ( Features: Washable ), ( Filter Height: 0.813 ), ( Filter Media Material: Cotton Gauze ), ( Filter Shape: Trapezoid ), ( Type: Oe Replacement ), ( Units: Each ), ( Part Type: Air Fuel ), ( Alt Mpn 1: 1011-4622 ), ( Alt Mpn 2: Knnbm-1821 ), ( Category 1: Air Filters / Cleaners ), ( Average Delivery Time: 2-3 Days ), ( Package Weight: 0.5500 ), ( Package Length: 10.00 ), ( Package Width: 8.00 ), ( Package Height: 1.50 ), ( Manufacturer Warranty: 30 Days )

Review K N FILTERS Replacement High flow Air Filter For Bmw

Introducing the BM-1821 High-Flow Air Filter, an exceptional upgrade for BMW vehicle owners seeking to optimize engine performance and enhance filtration efficiency. This air filter, manufactured by BMW Motorsport, is meticulously designed to meet the highest standards of automotive engineering.

The BM-1821 High-Flow Air Filter boasts a large surface area, enabling it to capture even the smallest of contaminants, including dust, pollen, and other harmful particles. The filter's increased filtration capacity is achieved through its multi-layered design, which includes a pre-filter and a fine-mesh filter. The pre-filter effectively traps larger particles, extending the life of the fine-mesh filter and ensuring optimal airflow.

This high-performance air filter is also designed with a high-flow intake system, allowing for increased airflow into the engine. The improved airflow results in a more responsive engine, delivering smoother acceleration and enhanced power output.

The BM-1821 High-Flow Air Filter is an OEM (Original Equipment Manufacturer) replacement part, ensuring a perfect fit and seamless integration with your BMW vehicle. Its robust construction is built to withstand the rigors of daily use, offering long-lasting performance and reliability.

Installing the BM-1821 High-Flow Air Filter is a straightforward process, making it an accessible upgrade for BMW enthusiasts. The filter comes complete with all necessary hardware for installation, ensuring a hassle-free experience.

In summary, the BM-1821 High-Flow Air Filter is an essential upgrade for BMW vehicle owners seeking to optimize engine performance, enhance filtration efficiency, and improve overall driving experience. With its large surface area, high-flow intake system, and robust construction, this air filter delivers unparalleled performance and reliability.

BMW BM-1821 High-Flow Air Filter: Pros, Cons, and Conclusion

The BMW BM-1821 high-flow air filter is a popular aftermarket upgrade for BMW vehicles. This air filter promises improved engine performance and increased power. In this analysis, we will discuss the advantages and disadvantages of investing in this air filter.

1. Enhanced Air Flow: BMW BM-1821 high-flow air filters offer increased air flow compared to the stock filters. This leads to better engine performance and improved throttle response.

2. Better Filtration: High-flow air filters provide better filtration than stock filters due to their larger filter surface area. This ensures that the engine receives clean air, which is essential for optimal performance and longer engine life.

3. Increased Power: The improved air flow and filtration can lead to an increase in horsepower and torque. This is particularly noticeable in turbocharged engines.

4. Better Fuel Economy: By providing better air flow and filtration, high-flow air filters can help improve fuel economy. This is due to the engine running more efficiently, which results in less fuel consumption.

1. Higher Cost: BMW BM-1821 high-flow air filters are more expensive than stock filters. This can be a deterrent for some BMW owners who are looking for affordable modifications.

2. Maintenance: High-flow air filters require more frequent maintenance than stock filters. This is due to their larger filter surface area, which can clog faster than stock filters.

3. Potential for Increased Engine Noise: Some high-flow air filters can lead to an increase in engine noise. This is due to the increased air flow, which can cause more vacuum fluctuations in the intake system.

4. Potential for Decreased Cabin Filtration: High-flow air filters may not provide the same level of cabin filtration as stock filters. This can lead to increased pollen and dust in the cabin, which can be a concern for some BMW owners.

The BMW BM-1821 high-flow air filter offers several advantages, including improved engine performance, better filtration, increased power, and better fuel economy. However, it also comes with some disadvantages, such as a higher cost, increased maintenance requirements, potential for increased engine noise, and decreased cabin filtration.

Based on the analysis, it is recommended that BMW owners consider their priorities and budget before deciding to invest in a BMW BM-1821 high-flow air filter. If they prioritize improved engine performance and are willing to accept the additional maintenance requirements and potential downsides, then this air filter could be a worthwhile investment. However, if they are on a tight budget or prioritize cabin filtration, then a stock air filter may be a better option.

Details:

Fuel-management modifications are not required for increased performance. FILTER height 0.813. 100% satisfaction guaranteed. FILTER SHAPE Trapezoid.

K N Filters Replacement High-Flow Air Filter for BMW BM-1821:: OE Filter Fits directly into OEM air box with application specific Sealing Bead to ensure a precise fit. Washable and reusable, pre-oiled ready to ride. MANUFACTURER PART NUMBER Bm-1821. Combined shipping available.

Made in the USA. Pleated media provides a large filtration area offering long service intervals.

part #: bm1821 prices

• $73.99-$100.48

specifications scoofilters:

• for makes: Bmw
• brand: K-n Filters
• mpn: Bm-1821
• model: High-flow
• base color: Black
• color/finish 2: Red
• features: Washable
• filter height: 0.813
• filter media material: Cotton Gauze
• filter shape: Trapezoid
• type: Oe Replacement
• units: Each
• part type: Air Fuel
• alt mpn 1: 1011-4622
• alt mpn 2: Knnbm-1821
• category 1: Air Filters / Cleaners
• average delivery time: 2-3 Days
• package weight: 0.5500
• package length: 10.00
• package width: 8.00
• package height: 1.50
• manufacturer warranty: 30 Days

shipping scooFilters:

• type: Calculated
• class: Standard
• carrier: FedEx
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• transit: 3-6 Days

payments scooFilters:

• wallet: Google-pay
• other
• credit card: Visa

offer scooFilters:

• availability: In Stock
• quantity: 2
• options: Ship-to-home
• started: November 26, 2025
• sold: 0

seller scooFilters:

• rating: 99.4%
• city: Hilliard, Ohio
• # reviews: 493970

returns scooFilters:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

general scooFilters:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Air Filters
• condition: New

K-n Filters BM-1821 Is Similar To:

• K n Engineering Ha-1330 K n Drop In Air Filters For 03-05 Honda Vtx1300c s r Used Excellent (41.3% similar) Was installed for 1 riding season, less than 500 miles. Used excellent condition. Save some cash and buy lightly used. Its in perfect shape...(May 30th, 2024)
• K n Filters Du-9098 Ducati 750 Super Sport Ss Ie 750ss Ss750 Air Filter K n (44.6% similar) The filter could use a cleaning. The condition is good. I am selling a used k n air filter. The part came off a 2001 ducat 750 super sport IE...(June 2nd, 2024)
• K n Filters 486467-78986 2003 Suzuki Hayabusa K n Air Filter 6724 (46.2% similar) Part #: k n Filters 486467-78986 for sale...(June 7th, 2024)
• K n Filters H090c6 08 Buell Xb12 Xb12x Ulysses K n Air Filter Cleaner (46.6% similar) Most parts ship within 24 hours. Shipping: free domestic shipping. Feel free to request a quote. No hardware included unless expressly stated...(June 25th, 2024)
• K n Filters Ha-6003 2006 05-06 Honda Cbr600rr Cbr 600rr K n Air Intake Filter Cleaner Element Unit (40.7% similar) Office use: Lr-DH 07/24 06HONDACBR600RR-300619...(July 3rd, 2024)
• K n A040e6 2005 04 05 Honda Cbr1000rr K n Air Filters Intake Cleaners (37.6% similar) Office use: Lr-rs 05CBR1000RR-100451...(July 9th, 2024)
• K n Filters H126a6 Yamaha Yzf R6 K n Performance Air Filter H096a6 (54.5% similar) This is a genuine k n part. Item condition: good used condition. Removed from a running riding 2001 Yamaha SF R6. Guaranteed to be in good used condition...(July 10th, 2024)
• K n Air Filter 437-78896 2006 Honda Cbr1000rr K n Filters 71124 (28.1% similar) Part #: k n air filter 437-78896 for sale...(July 11th, 2024)
• Bmc 374 16 2005 04 05 Honda Cbr1000rr Cbr 1000 Air Filters Intake Cleaners (27.5% similar) Office use: Lr-rs 05CBR1000RR-100423...(July 21st, 2024)
• K n Filters Su-6503 2003-2009 Suzuki Sv650s K n Air Filter Clean Used (46.6% similar) Good condition air filter. Blown out thoroughly, ready to go. Offers taken but buy now secures the item...(July 23rd, 2024)
• K n Filters Ha0011 1998 Honda Vtr1000f Superhawk K n Air Filter (45.7% similar) See pictures for condition. Overall its it good shape lots of life left. The bike was not tested I did have a ignition key. Make an offer. Most of the plastics were cracked no other major damage...(July 27th, 2024)