Parts & Accessories Spare parts Suburban 1993 agency muffler, not emptied, with its agency Y-pipe and its front and rear pipes with the rear outlet (agency outlet on the right side), free from rust. For sale to the highest bidder. Muffler and pipes size approximately 3 inches. Outlet approximately 3.5-4 inches. Y-pipe 2.5/2.25 - 3 inches.