This is the OEM ‘donut’ style exhaust gasket fits between the lower downpipe and midpipe on the stock exhaust system for the Subaru WRX or STI. This part can come in handy if your gasket gets lost or damaged during installation or you simply want to install a fresh one just in case. While most aftermarket exhaust systems use a flat style gasket, the Cobb Tuning and Borla exhaust systems require you to retain this stock ‘donut’ gasket. This gasket is also required when using a downpipe adapter with a 3in flat flange downpipe.
Part Number: 44022AA123