Remark's exhaust system for the 2017-Present Honda Civic Si (Coupe FC3 and Sedan FC1) offers an uncompromised, sporty sound. Available in two part numbers for the coupe and sedan, this single Cat Back System features a 2.5" to 3" mandrel bent piping and dual 3.5" high flow mufflers with slant cut tips. Crafted from full T304 stainless steel, the system ensures optimal weight reduction and high-quality welding, tailored for each Civic Si model to ensure precision fitment.