K&N 33-2304 High Performance Replacement Air Filter for 2003-2017 Subaru 1.5L/1.6L/2.0L/2.5L/3.0L/3.6L Designed to boost horsepower and rate of acceleration Can be cleaned and used again High air flow with exceptional filtration Lasts up to 50,000 miles before cleaning is required depending on driving conditions Works with original equipment manufacturer vehicle electronics