This extension pipe is used to fit the 140680 140680BC systems to the longer Wheelbase 140.6 Double (Crew) Cab with Long Bed (6' 1) models. Includes 1) 2.5 clamp. Built from premium austenitic T - 304 stainless steel, superior to T - 400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA stands behind every extension pipe with a Million - Mile Warranty. Just what youd expect from the worlds most experienced (and most winning) exhaust brand.