![Injen Cat-Back Stainless Steel Exhaust For 2017-2021 Honda Civic Si (Sedan Only) [Fc1] 1](https://carpartsmall.shop/wp-content/uploads/2026/05/088bd65e77582c39628064ff09362be0-tSoMcW.tmp_.webp)
![Injen Cat-Back Stainless Steel Exhaust For 2017-2021 Honda Civic Si (Sedan Only) [Fc1] 2](https://carpartsmall.shop/wp-content/uploads/2026/05/ca37a6cf19d63705876a2ccd419f2d78-eK8ILD.tmp_.webp)
Description
The Injen Technology engineers are experts when it comes to performance—PERIOD. From cars to trucks to powersports, Injen offers a wide variety of exhaust systems to choose from.
All Injen Technology performance exhaust systems are constructed from mandrel-bent stainless steel tubing. Mandrel bending ensures the tubing maintains its shape and diameter throughout the entire length, providing smooth, unrestricted airflow. From the investment-cast flanges to the custom hangers, all Injen exhaust systems are 100% TIG welded and handcrafted in the USA, and include all tubing, mufflers, and hardware necessary for a hassle-free installation.
Each system is uniquely designed to deliver an aggressive sound that brings out serious power. Like all other Injen products, Injen exhaust systems are proudly built in Pomona, CA.
Installation Instructions
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2017-2020 | Honda | Civic | Si |
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