Injen 17-20 Honda Civic Si 1.5L Turbo (Sedan Only) 3in Cat-Back Stainless Steel Exhaust

Starting with 3-inch diameter, mandrel-bent 304 stainless steel tubing, this Injen cat-back exhaust system is built for your 2017-2020 Honda Civic Si Sedan. Mandrel-bending is key here because it ensures the pipe maintains its full diameter throughout the bends, which means smoother airflow and better performance compared to crush bends. This system is designed to bring out a more aggressive sound from your 1.5L turbo engine, and Injen has integrated a resonator to keep the tone crisp and clean, not raspy. You can expect dyno-proven gains of up to 11 horsepower and 10 lb-ft of torque with this setup.

Every part of this Injen exhaust is TIG welded by hand right here in the USA, using investment cast stainless steel flanges for a solid connection and easier installation. The center exit design is meant to work with your factory rear valance, and it's capped off with a pair of beautiful 4.0-inch burnt titanium exhaust tips that really give the rear of your Si a custom look. All the necessary premium stainless steel hardware and hangers are included, so you won't need to cut or weld anything to get this system installed. It’s a complete package designed for a hassle-free upgrade.