This is MagnaFlow's Cat-Back for the GMC Sierra or Chevy Silverado 1500. The Street Series features a 3" Main Piping Diameter with an Exit Style Dual Split Rear. The Inlet Connection Type is a basic Clamp-On with a Straight-Through Muffler Type made of Satin with a Welded-On;Double Wall;Angle Cut;Rolled Edge finish. The Tip Material is Stainless Steel with a Diameter of 3" and a length of 12”. .