Downpipe 8 bolts Garrett GT25 / GT28 / t25 / t28 on 3 "V-Band Material: cast iron. Allows simple construction of a high-flow exhaust system. A properly selected shape of the housing allows you to accelerate the flow of exhaust gases from both the turbine outlet and the wastegate valve. using the V-Band connector assembly and disassembly is extremely simple.Downpipe 8 Garrett GT25 / GT28 / t25 / t28 screws on a 3 "V-Band Material: cast iron. Allows for a simple construction of a high-flow exhaust system. exhaust from both the turbine outlet and the wastegate valve. Thanks to the V-Band connection, assembly and disassembly is extremely simple.