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Our Civic Type-R Sports Cat Downpipe replaces the standard restrictive downpipe and catalytic converter with a stainless steel, 2.5" one-piece item. Increasing the bore of the downpipe and replacing the restrictive catalytic converter with a sports catalytic converter allows the exhaust gasses to flow much more freely, increasing the power output of the engine and improving throttle response.Features: Manufactured from T304 stainless steel 2.5" bore TIG welded, CNC machined flanges Gaskets included