Engineered to fit easily into your factory air box. Designed to increase horsepower. In K&N’s dyno testing, they have seen gains in the 3 to 8 whp range, compared to OEM filters. Washable, reusable, and engineered to last for the life of your vehicle. Designed to provide high airflow and exceptional filtration. 10-Year/Million Mile Limited Warranty. Only needs cleaning every 50,000 miles under normal highway driving conditions. Emissions legal in all 50 states. Will not void vehicle warranty. Two filters are required per car.