This is MagnaFlow's Cat-Back for the GMC Sierra or Chevy Silverado 1500. The Street Series features a 3.5" Main Piping Diameter with an Exit Style Quad 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;Folded Edge finish. The Tip Material is Stainless Steel with a Diameter of 3.5" and a length of 12.25”. .