This 3 diameter extension pipe is used to adapt Crew Cab with Short Bed (5' 7) 144.5 wheelbase systems (140415, 140416, 140417) to Crew Cab with Standard Bed (6' 7) 156.5 wheelbase vehicles. Includes 1) 3 clamp. Built from premium T - 304 stainless steel, superior to T - 400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra - smooth mandrel bends ensure maximum flow power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA stands behind every adapter extension pipe with a Million - Mile Warranty. Just what youd expect from the worlds most experienced (and most winning) exhaust brand.