Arduino MOSFET Switch N Channel IRF520 + PWM [Tutorial] DeepBlue K&N Replacement Air Filter R900RT HP2 R1200. K&N washable, reusable High Flow Air Filters feature a state of the art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle. K&N drop in Replacement Filter: s are designed to install easily into your factory airbox. Upgrade today and start enjoying superior airflow and superior performance from K&Ns most popular product! Features: Designed to increase horsepower. Washable, reusable, and engineered to last for the life of your vehicle. Designed to provide high airflow and exceptional filtration. Engineered to fit easily into your factory airbox. Only needs cleaning every 50,000 miles under normal highway driving conditions. Specifications: Filter Material: Cotton Gauze Washable: Yes Height: 1. 25in (32mm) Outside Length: 5. 875in (149mm) Outside Width: 3. 5in (89mm) Filter Re Oiling Amount: 0. 32oz (9ml)