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K And N Air Filter - K and N Air Filter Review - User Reviews of K&N Air Filters

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K&N Engineering has been in the automotive air filter industry since 1969. In that time, they have designed air filters meant to help motor vehicles of all sorts run at peak efficiency. The company now has over 2,400 different after-market air filters in their portfolio. Many enthusiasts use K&N air filters in their specialty vehicles, and they are the only filters used in the Indianapolis 500.

The K and N air filter (more properly, K&N) that leads their line today is the FilterCharge model. The FilterCharge is designed for high airflow without the restrictions and blockage caused by standard paper filters. K and N filters are hyped as being able to add 1 to 4 extra horsepower to any vehicle. This is purportedly due to the K&N filter design that uses 100% cotton gauze to achieve maximum airflow. One benefit of the cotton filter is that it can be washed and reused, so one filter can theoretically be used for the lifetime of a vehicle.

K&N filters were originally made to be used by off-road vehicles and motocross bikes. The cotton filter consists of 4 to 6 layers held in place between aluminum wire mesh. It is then pleated, and a special oil is applied to resist dirt and dust. K&N claims that tests done by the Society of Automotive Engineers proves that their design gives an engine maximum airflow, while retaining the top standards of safety. The company also loves to point out that their filter has been used in a real-world test by Carl Judice who drove is Chevrolet pickup truck over one million miles with the same filter. This has prompted K&N to give their filters a one-million-mile guarantee.

In order to keep K&N air filters at their best, it is necessary to clean and re-oil them every 50,000 miles. To make the process easy, the company sells a Recharger service kit that comes with all the materials necessary and complete instructions. The kit contains enough material for 5 to 10 cleanings.

User Reviews of K&N Air Filters

As with all products, automotive or not, what the company claims they do and how they hold up with consumers are two totally different animals. K&N has set extremely high standards for their air filters to live up to.

All-in-all, users who install a K&M air filter have reported a completely positive experience. Detractors of these high-end filters are few and far between.

Pros of K&N Air Filters

The benefits reported by using K&N air filters are as follows:

• Snug, full fit – K&N filters are custom-designed to make and model specifications.
• Improves fuel economy – Users report at least 1 extra mile per gallon, and some report up to 3.5 mpg improvements.
• Environmentally friendly – Standard filters must be replaced every 15,000 miles and are thrown away after use. K&N air filters only need be cleaned every 50,000 miles and are often the last air filter bought for a vehicle.
• Long warranty – The K&N warranty covers the filter for 1 million miles or 10 years, whichever comes first.
• Easy installation – 5-minute installation time is average.
• Improves horsepower – Some users have reported gains of up to 15 hp.

Cons of K&N Air Filters

• Expensive – K&N air filters require an upfront cost that is 50 to 100 percent higher than standard filters.
• Filtering may not be as effective as standard filters – This is a user-reported claim not backed by scientific studies.
• Reduced low-end torque – Some users report decrease in torque.
• Significant increases in power may require a full K&N intake kit.

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