The 3" catback system from AVO for the Legacy GT (05-09) offers improved flow and a deep, smooth sound. The center pipe section includes a resonator and is 3" stainless steel all the way through with 2 x 60mm (2.5 inch) piping from the y-pipe to the rear muffler joins. The entire system is constructed from 304 Stainless Steel, including the flanges.