Adapts BORLA® 147.4" Wheelbase systems to Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicle 3" ID inlet, 3" OD outlet, 12" long 3" clamp included 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. 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.