Exhaust flange. Greatly facilitates the construction of the 6-1 manifold. High-quality workmanship. Material: stainless steel Wall thickness: 3mm Inner diameter of the inlet pipes: 47mm Mounting flange: T3 T4 Exhaust system sheet. It greatly facilitates the construction of the 6-1 manifold. High quality workmanship. Material: stainless steel Wall thickness: 3mm Inner diameter of inlet pipes: 47mm Mounting flange: T3 T4