"Custom ATP stainless steel turbo downpipe designed to work with MK2, MK3 and MK4 chassis cars. Two piece design allows flexibility in installation of downpipe. Made to work with ATP cast iron turbo manifold and T3 or T3/T4 turbo. 2.5" diameter with stainless steel flex section. Designed for integral wastegate setup. Can be used with external wastegate with purchase of T3 discharge flange. *Two piece downpipe can be clamped together but welding is recommended."