Downpipe by TurboWorks, made of stainless steel.Downpipe designed for: Opel Astra GH OPC 2.0Dimensions: Outer diameter - 2.5 "63mm Outer diameter of v-band flange - 99mm spacing of flange mounting holes - 3 x 74mmDownpipe by TurboWorks, made of stainless steel. Downpipe designed for: Opel Astra GH OPC 2.0 Dimensions: Outer diameter - 2.5 "63mm Outer diameter of the v-band flange - 99mm spacing between the mounting holes of the flange - 3 x 74mm