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The Focus ST and RS are performance variants where rear suspension precision directly affects handling balance
Factory tested
This overall design prevents water from descending into the oil pan if ever present
Direct fitment for 99-05 models
PERRIN Replacement Cone Filter 3.125in - Universal PDM_tools The Focus ST and RSPERRIN Replacement Cone Filter 3. 125in Universal RallySport Direct carries a great selection of aftermarket performance products brought to you by PERRIN Performance. This is the PERRIN Replacement Cone Filter. This is a direct replacement for most Subaru PERRIN Performance intakes systems including the Big MAF intakes. It will also work on any intake system which accepts a 3. 125" filter. DETAILS: Unique two piece design Reticulated polyurethane