This 3" diameter extension pipe is used to adapt Crew Cab with Short Bed (5' 7") 144.5" wheelbase Cat-Backâ„¢ systems (140415 140416 140416BC and 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 youâ€d expect from the worldâ€s most experienced (and most winning) exhaust brand.