The K&N Flame Arrestor makes the best air-filtration technology available for marine engine use. Marine application owners can experience the increased horsepower and engine protection provided by K&N's oiled cotton gauze and epoxied screen filter element. For high performance on the water, K&N Flame Arrestors will help you fly. The K&N Flame Arrestor makes the best air-filtration technology available for marine engine use. For high performance on the water, K&N Flame Arrestors will help you fly.