It is compatible with the older vehicles that used barbed fittings, newer vehicles that use SAE quick connect fittings, and aftermarket fuel rails that include a 6AN male inlet fitting. The OEM feed line is replaced with larger 3/8" vapor shield fuel hose and -6AN PushLok hose ends. NOTE: depending on the Subaru model/year, the secondary air injection or washer fluid reservoir may need to be slightly relocated.