Porsche 955 957 Air Filter STANDARD (x2) OEM Mahle Air Filter STANDARD DUTY replacement filter (set 2) NOTE: not for cars with ''Heavy Duty'' air filtration system. Porsche part# 955 110 131 00, check fit below. Recently made by MAHLE-KNECHT (OEM), not been lying around. Please see FITMENT CHART below, under PRODUCT DESCRIPTION.