For Nissan 370Z Stainless Steel Turbo Downpipe/Dump Pipe - Fairlady Z Z34 Infiniti G37 Made of high quality T-304 stainless steel with computerized mandrel-bends TIG welded CNC machine flange for strength and durability Maximizing smoothest exhaust airflow Increase engine output and efficiency. Gain 10 - 15 HPs (approximately) O2 Sensor Bungs insertion, bolt(s) and metal gasket(s) included