aFe Power Gas Cat-Back Exhaust System for Honda Civic Si Sedan 2017 - 2020

Performance Gains: This system produced gains of up to +3 HP and +5 lbs. x Ft. TQ. , as measured on our in-house dyno.2-1/2" 304 Stainless Steel Construction: This cat-back exhaust system is constructed of 2-1/2" mandrel-bent 304 stainless steel tubing for maximum strength and durability.High-Flow Stainless Steel Muffler: This system features a high-flow stainless steel muffler, producing a deep sound. (Muffler finish may vary)Dual 4-1/2" Diameter Black Exhaust Tips: Finishing off this exhaust system are dual 4-1/2" diameter black 304 stainless steel clamp-on exhaust tips. The tips features a laser etched Takeda logo for a unique style.Installation: Utilizing a factory style flange and hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation.Integrated Mitered Merge Collector: A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response.Computer-Aided Design: Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment.MIG-Welded: 100% MIG-Welded for race-proven strength and durability.Emissions Disclaimer: This product does not require a CARB EO#.aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility.