This extension pipe is used to adapt the 147.4 Wheelbase BORLA systems to vehicles with Crew Cab with Standard Bed (6' 7) 157 wheelbase. 3 ID inlet, 3 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 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.