K&N pioneered the concept of replacing the restrictive factory air filter with a more efficient washable and reusable filter. Their extensive research proved that you could significantly increase horsepower and fuel economy this way. Today's cold-air intake systems have taken it a step further by placing a high-flow air filter away from the engine and directing more cool air through the filter which results in even greater power and fuel economy gains. With today's fuel prices, a cold-air intake kit has become a "must-have" item for our customers that want extra power and insist on better fuel mileage from their gas or diesel powered cars and trucks. Reusable filters will never need to be replaced, so you'll save money and help save the environment by keeping unnecessary waste out of the landfills and using less fuel. We also offer FREE SHIPPING on many of our performance air filters and intake kits when shipped to the lower 48 states.