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Our Impreza Classic Sports Cat Downpipe replaces the standard restrictive downpipe and catalytic converter with a stainless steel, 3" one-piece item with a built-in sports cat. Increasing the bore of the downpipe and replacing the restrictive catalytic converter allows the exhaust gasses to flow much more freely, increasing the power output of the engine.Features: Manufactured from T304 stainless steel 3" bore Built-in non type approved 200CPI sports cat TIG welded, CNC machined flanges Lower gasket and bolts included