3-Inch Cat-Back Exhaust System

The Cobb Tuning 3-Inch Cat-Back Exhaust System is engineered for enhanced exhaust flow and performance, specifically for select Subaru WRX and STI models. This system boasts a 3-inch diameter throughout, a significant upgrade from the stock 2.5-inch piping, directly addressing flow limitations in high-output vehicles. Constructed from durable 304 stainless steel with precise mandrel bends, this cat-back exhaust ensures a consistent 3-inch diameter through all curves, preventing any bottlenecks. This design is particularly advantageous for Stage 2 and more advanced builds, where increased exhaust gas volume from modified turbochargers can be significantly hampered by restrictive factory systems. The larger bore effectively maintains lower backpressure across the entire RPM range. The 3-inch diameter not only improves performance by facilitating better exhaust gas evacuation but also contributes to a more aggressive and louder exhaust note, befitting a performance-oriented vehicle. This system is designed as a direct replacement for the factory cat-back section, and it includes all necessary hangers, gaskets, clamps, and hardware for a complete installation. Cobb Tuning, with its extensive experience in performance hardware and software since 1999, ensures this product is validated as part of a complete system for reliable and consistent results. This cat-back exhaust is specifically designed to fit the 2011-2014 Subaru WRX (EJ255 MT) and the 2008-2021 Subaru WRX STI (EJ257 MT).