X-Box Muffler 2.5 in Replaces Center Resonator w/X-Pipe Muffler Gasket/Hardware/Clamps Incl Polished 304 Stainless Steel Pypes Performance ExhaustDirect fit for stock 2005 2006 GTO. Replaces center resonator with high flow X pipe Muffler. Installs in less than 20 minutes. Cut two mid pipes and bolt right in for 10 hp and incredible sound. Includes gasket, hardware, and clamps. Features: Direct Fit For Stock 2005 2006 GTO Replaces Center Resonator With High Flow H pipe Muffler Installs In Less Than 20 Minutes Cut Two Mid Pipes And Bolt Right In For 10hp And Incredible Sound Comes With Gasket;