Downpipe by TurboWorks, made of stainless steel.Downpipe intended for: ASTRA G OPC 2.0T 1998-2004 ASTRA H OPC 2.0T 2004-2014 Dimensions: Outer diameter - 2.75 "(70mm) Turbo flange hole spacing - 3x74mm Exhaust flange hole spacing - 98mmDownpipe by TurboWorks, made of stainless steel.Downpipe intended for: ASTRA G OPC 2.0T 1998-2004 ASTRA H OPC 2.0T 2004-2014 Dimensions: Outer diameter - 2.75 "(70mm) Turbo flange hole spacing - 3x74mm Flange hole spacing exhaust - 98mm