Remark Sport Touring Exhaust 2017-2021 Honda Civic Si Coupe (FC3) / Civic Si Sedan (FC1)Uncompromised exhaust sound for your daily driven vehicle. Remark exhausts are engineered to provide a sporty note for your vehicle without excessive and obnoxious sounds. Remark is extremely proud of its high quality welding and precision fitment accuracy. *Check the correct model before purchasing *The Coupe and Sedan length are slightly different Exhaust Type Single Cat Back System 3pc design Piping Diameter 2. 5" neck expanded to 3" piping mandrel