3-Inch Cat-Back Exhaust System

The Full Race catback exhaust system is engineered for the 2012-2015 Honda Civic Si (9th Gen) with the K24Z7 engine, and is suitable for naturally aspirated, supercharged, and turbocharged applications. This 3-inch diameter system is constructed from mandrel-bent stainless steel tubing, designed to maximize flow and reduce backpressure for improved throttle response and power gains across the RPM range. It is also sized to support future forced induction upgrades, promoting faster turbo spool times. The exhaust system features V-band clamps for secure, leak-free connections and easier alignment during installation, replacing traditional slip-fit connections. It utilizes factory hanger locations, requiring no cutting or welding for a bolt-on installation. Installation hardware and gaskets are included. This catback exhaust is available in two versions: FG4 for the 2-door Coupe and FB6 for the 4-door Sedan. It fits the 2012-2015 Honda Civic Si Coupe (FG4 chassis) and the 2012-2015 Honda Civic Si Sedan (FB6 chassis). It also fits the 2013-2015 Acura ILX 2.4L, though proper fitment verification is recommended for the latter.