So that's the K&N filter.

Because vehicle makes, models, and engine sizes vary widely, along with vehicle condition and environmental factors, horsepower gains also vary across applications and individual vehicles. However, K&N intakes typically add an average of 15-25 additional horsepower over a stock system**.

As a result, K&N filters are able to hold significantly more dirt and particulate matter per square inch of media over an average paper filter.

Disadvantages of Buying K&N Because K&N filters use an oiled filtering element, there may be long term problems in vehicles equipped with mass air flow sensors, as oil can build up over time and cause fouling or errors in the sensor which require cleaning.

Improved engine sound: K&N filters can enhance the sound of your engine, providing a more aggressive, sporty tone. Reusable and washable: K&N filters are washable and reusable, making them a cost-effective alternative to disposable paper filters.

A brand new filter should have a pressure drop of between 2 to 3″ w.c. (water column). Once the pressure drop exceeds 10 to 15″ w.c., the filter should be replaced or changed. Paper media filter elements are often considered disposable, but can be cleaned.

Because vehicle makes, models, and engine sizes vary widely, along with vehicle condition and environmental factors, horsepower gains also vary across applications and individual vehicles. However, K&N intakes typically add an average of 15-25 additional horsepower over a stock system**.

MERV ratings might lead you to believe that high efficiency air filters are the way to go. However, they can work so well sometimes that they cause your HVAC system to be less efficient because they block too much airflow. This leads to higher energy bills and could damage your furnace if it overheats.

More people walking into your home increases the amount of dirt and contaminants in your home. Furry pets also introduce hair, dirt, and pet dander. And the more contaminants floating around in your home, the faster your filter gets dirty.

A dirty filter can cause allergens to build up in your duct system, and they'll linger there for months. Whenever you have a forced-air system running, those allergens will be released into the air you breathe. You might even end up with a mold problem in the ducts.

Disadvantages: Can be expensive, especially for large scale filtration. Maintenance and replacement of filters can be costly. May not be effective in removing all impurities from the liquid.

K&N filters offer exceptional airflow to your engine - and more airflow often translates to more efficient fuel burn. Disposable filters aren't typically designed with the performance enthusiast in mind; they are designed to be simple, cheap, and functional.