The TurboXS stock downpipe-to-3" catback adapter for Subaru WRX/STI allows use of a 3-inch catback with the factory downpipe by accommodating the OEM donut gasket on the 3" flat flange. Machined from 304 stainless steel, the adapter resists corrosion and is intended to prevent exhaust leaks where a larger catback is being fitted to the stock downpipe configuration.
Turbo XS Subaru WRX/STI OEM Downpipe to 3in Cat-Back Adapter w/Standard Exhaust Gasket