Grimmspeed Subaru-fit donut gasket.
Fits at the front of the cat-back exhaust section, and allows your exhaust that little bit of flex while still sealing exhaust gases in.
Fits all 2002-2014 turbo Subaru models.
Availability note: GrimmSpeed is having trouble with supply these days, and many parts are on backorder. Please call to check stock status.