T6 3D Exhaust Transition Flange 4”

T6 to 4″ exhaust inlet flange. Choose between 4″ 16 gauge tube which is 4.0″ OD and 3.875″ ID or 4″ Schedule 40 pipe which is 4.5″ OD and 4.0″ ID. Tubing is measured by nominal od whereas pipe is measured by nominal id. Flange is 3D profiled, CNC machined in-house to maximize air flow. Weldable mild steel. Stud and nut kit to mount the turbo available here https://keatingmachine.com/product/m10-stud-nut-kit/ Fits most GT55,HC5A,HX80,HX82,HX83,HX60,S400,S500 & T18A turbochargers.