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Replacing the standard Up-Pipe with our high performance decat Up-Pipe will improve your Impreza's exhaust gas flow dramatically due to the removal of the restrictive catalytic converter, resulting in increased power output ,improved throttle response and reduced turbo lag.Features:Manufactured from mandrel bent T304 stainless steelTIG welded2.5" bore with 12m thick flangesIncludes flexi joint to allow for expansion of the manifold