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

The Injen Technology engineers are experts when it comes to performance, PERIOD. From Cars to Trucks to Powersports, Injen has a variety of exhaust systems to choose from. All of Injen Technology Performance exhaust systems are constructed from mandrel bent stainless steel tubing Mandrel-bending ensures the tubing maintains its shapes and size 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 offer an aggressive sound that brings out some massive power. Like all other Injen products, the Injen exhaust systems are proudly built in Pomona, CA.

Additional Information

Performance Exhaust System, Part No. SES1581TT, 2017-2020 Honda Civic Si L4-1.5L Turbo, Sedan Only.

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

• Beautiful dual 4.0"burnt titanium exhaust tips
• Center exit design fits with factory rear valance
• Designed And Made In Pomona; CA
• Dyno Proven gains of up to 11 hp and 10 lb?ft of torque
• Features Injen's integrated resonator for crisp, clean sound
• Fits Civic Si Sedan models ONLY
• Full 76MM piping made from premium 304 SS Mandrel-Bent Tubing
• Hand Crafted and TIG Welded to Perfection for Strength and Durability
• If you're looking to improve sound, power, and looks then this is the system for you!
• Manufactured in Pomona, California USA
• No Cutting or Welding Required
• Premium Stainless Steel Hardware and Hangers
• Stainless Steel Investment Cast Flanges For a Fast and Easy Install

Important Notice relating to US Domestic Market Trucks & Pickups

Many US-market trucks and pickups are available in multiple cab and bed-length configurations (e.g., Single Cab, Extended Cab, Double/Crew Cab, CrewMax, 5.5ft/6.5ft/8ft beds, etc.). Exhaust system fitment can vary between these chassis versions.

Where available, we list all compatible vehicles, cab types, and bed lengths in the product description. However, depending on your exact configuration, some systems may require optional extension/mid-pipes or minor modification for correct fitment.

Because of these variations, please carefully check your cab configuration and bed length before purchasing. If you are unsure, or if your vehicle has been modified, please reach out to a StreetFX agent.

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Product Details

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Performance Exhaust System Part No. SES1581TT 2017-2018 Honda Civic Si L4-1.5L Turbo *Sedan Only*

Injen Technology's Super SES exhaust systems are dyno-tuned to complement their performance intake systems. In doing so, the Super SES systems provide maximum horsepower and torque across the power band. The Super SES exhaust systems are manufactured from 100 percent 304 stainless steel. Each exhaust system features CNC mandrel-bent stainless steel tubing, CNC-machined flanges, and robotic TIG welding. They also feature a straight-through muffler and Injen's unique flared tip design.