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The Perrin drop-in air filter for the 08-11 Subaru STI uses a 2-stage foam filtration element to improve airflow in your stock air box; providing improved power and airflow while removing harmful particles from the incoming air. Using a special oil coating, the foam filter catches dirt particles while allowing air to pass unimpeded through the high-flow foam. This filter can be cleaned and re-oiled using the Perrin cleaning kit, sold separately.
FITMENT: 08-11 WRX/STi & 05-09 LGT
Part Number: PSP-INT-110