System1 Designs T4 Non-Divided Turbo Inlet Flange High Quality Affordable Solution Looking Fabricate Mild Steel Turbo Inlet Flange Manifold Exhaust The System1 Designs T4 Non-Divided Turbo Inlet Flange is a high quality, affordable solution for those looking to fabricate a T4 turbo manifold. Features: Perfect use with T4 custom turbo setups. Affordable mild steel construction 1/2" thick material helps to avoid warping from the welding process CNC tapped and countersunk for use with M10x1.25 hardware Universal fit with T4.