K&N Engineering
K&N BMW Drop In Air Filter - 33-2231
- SKU:
- KNN33-2231
- UPC:
- 024844092304
- MPN:
- 33-2231
- Availability:
- Regularly stocked product
Description
How often should I clean my K&N air filter?
Clean your K&N drop-in air filter every 50,000 miles to maintain optimal airflow and engine protection for your vehicle.
Is a K&N air filter a performance upgrade?
Yes, K&N drop-in air filters are engineered to improve airflow and deliver a noticeable increase in horsepower for your vehicle.
K&N Drop-in Air Filters provide superior engine performance, earning a score of 9 for Engine Performance. Their state-of-the-art design features layered, oiled cotton media engineered to improve airflow. Experience a significant upgrade in horsepower and sustained peak performance with this washable, reusable air filter.
Key Features
- washable, reusable High-Flow Air Filters
- state-of-the-art design of layered, oiled cotton media
- engineered to improve airflow and capture contaminants
- designed to provide an increase in horsepower
- reusable, engineered to last for the entire lifespan of your vehicle
- backed by K&N's 10-Year/Million Mile Limited Warranty
Why Choose the KN Drop in Air Filters
Delivers sustained peak performance with a filter you can clean and reuse.
Achieves superior engine protection by trapping more harmful particles.
Provides a noticeable boost in acceleration and responsiveness.
Transforms your driving experience with enhanced engine breathing.
Who Is This For?
Street Performance — 8/10
Engineered to improve airflow and increase horsepower.
Engine Performance — 9/10
High-Flow Air Filters designed to improve airflow.
Easy DIY Install — 10/10
Drop-in install type, easy to replace existing filter.
Racing Competition — 7/10
Designed to provide an increase in horsepower.
Daily Driving Comfort — 6/10
Improved airflow may offer subtle driving experience enhancement.
Fuel Efficiency — 5/10
Improved airflow can potentially aid fuel efficiency.
Frequently Asked Questions
What is a K&N drop-in air filter?
A K&N drop-in air filter is a washable, reusable high-flow air filter designed to directly replace your vehicle's stock air filter. Engineered to improve airflow and capture contaminants, it fits the 1999-2006 BMW 318ti/323Ci/323i and 10 more applications, offering superior engine protection and enhanced engine breathing for sustained peak performance.
How do I clean a K&N drop-in air filter?
Cleaning a K&N drop-in air filter involves using a K&N Recharger Kit to restore its filtration and airflow capabilities. This easy maintenance level ensures the filter remains reusable and engineered to last for the entire lifespan of your vehicle. Simply follow the kit's instructions for a thorough cleaning.
What performance gains can I expect from a K&N drop-in air filter?
Upgrading to a K&N drop-in air filter delivers a noticeable boost in acceleration and responsiveness. With a high 'Engine Performance' score of 9, this filter is engineered to improve airflow, providing an increase in horsepower for a transformed driving experience with enhanced engine breathing.
How difficult is it to install a K&N drop-in air filter?
Installing a K&N drop-in air filter is straightforward, with an 'Easy DIY Install' score of 10. Its drop-in install type means it easily replaces your existing filter without any modifications required. This confident fitment ensures a simple upgrade for enhanced engine performance.
Important Notices
⚠️ Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Additional Information
Clearance Item: |
N |
MPN: |
33-2231 |
Proposition 65: |
Y |
Case Lot Quantity: |
1 |
Category: |
Air Filters>Air Filters - Drop In |
Install Type: |
Drop-In |
Product Level: |
Premium Performance |
Street Performance: |
8/10 |
Engine Performance: |
9/10 |
Easy DIY Install: |
10/10 |
Racing Competition: |
7/10 |
Daily Driving Comfort: |
6/10 |
Fuel Efficiency: |
5/10 |
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