Includes 2) Extension Pipes and 2) Clamps. This 2.5" diameter x 21.4" long extension pipe kit is used to adapt the Borla(r) 145.7" Wheelbase Cat-Back(tm) systems to fit Extended Cab with Long Bed 164.6" Wheelbase vehicles. 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 adapter/ extension pipe with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.