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Home » Subaru WRX/STI » Exhausts & Components » Exhaust Systems   Cobb SS 3" Cat-Back Exhaust for STI The COBB catback exhaust does not deviate from the factory emissions equipment and conforms to the SAE dictated 95-devibel exhaust noise level limit enforced by California, as well as other states in the US. This system is modeled after the stock exhaust fitment locations, therefore making it an easy direct bolt on item inclusive of all needed gaskets and hardware. Subaru Impreza STi 2004-2007     Price: $645.00   « Previous | Next »