11400 is a simple adaptor flange that will allow customers to connect a 3 inch downpipe to a stock cat-back exhaust system without the leaks generally assossiated with these scale down connections. This product was designed for the Subaru WRX / STi but should fit numerous applications that have not been tested. Part #: 11400 Zen Price: $35.00 Application: Subaru WRX / STi Includes: Flange Only Addition Parts Suggested: 3inch gasket, OEM donut gasket, longer bolts Let me know if you are interested in picking up this product!