This extension pipe is used to adapt the Borla(r) 147.4" Wheelbase Cat-Back(tm) systems to fit Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles. The extension pipe dimensions are 3.5" ID inlet, 3.5" OD outlet, 12" long. Includes 1) 3" clamp. Built from premium, high-quality austenitic T-304 stainless steel, to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, Borla(r) stands behind every extension pipe with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.