Additional Images

Injen Performance Exhaust System - SES9004

2016-2018 Ford Focus RS L4-2.3L Turbo
Pricing: $1,415.95

Free Ground Shipping on orders over $200.00- 48 continental states


The 2016-18 Focus RS is a machine the demands attention and respect wherever it’s driven. The Injen Technology cat-back exhaust system compliments the Focus RS with impressive power, gorgeous looks, and a distinct sound that is unmatched.

Unlike our competition that uses stepped down tubing, the Injen Technology system is a full 3” cat-back unit that is mandrel bent using only the best 304 stainless steel available. Another unique feature of the Injen cat-back exhaust system for the RS is that is utilizes individual resonators instead of a single traverse style muffler. Not only does this provide a unique sound, but also help to free up power throughout the RPM range. Injen Technology also decided to bypass the factory exhaust valve and provides a custom exhaust valve bypass module (P/N 2002) with every Injen Focus RS exhaust system. This allow you to enjoy that rich, crisp sound of your RS whenever you want.

The rear of the Injen Technology RS cat-back system is a work of art and employs multiple slip fittings to allow an infinite amount of adjustment for a precise fit right out of the box. Dual 4” black chrome exhaust tips complete the exhaust and provide a finished look.

Quality Construction:
This Injen Technology exhaust system is constructed from 3” mandrel-bent 304 stainless steel tubing for maximum flow and long service life. From there, every aspect of the system is hand TIG-welded by our experts in our Pomona, California headquarters.

Dual Black-Chrome Exhaust Tips:
Dual 4” black chrome exhaust tips are the finishing touch on this beautiful exhaust system. The tips bolt-on for easy adjustments and provide a visual punch that will set your Focus RS apart for the pack!

Exhaust Valve bypass module included:
Injen Technology decided to bypass the factory exhaust valve and provides a custom exhaust valve bypass module (P/N 2002) with every Injen Focus RS exhaust system. This allow you to enjoy that rich, crisp sound of your RS whenever you want and without fear of your valve sticking open or closed when you least expect it.

OE Style Fitment:
OE-Style exhaust hangers are used throughout that utilize the OE hanger bushing that came with your Focus RS. This allows the system to install and flex like the factory system during high-stress situations without any damage. A true hassle-free installation with no cutting required.

Dyno Proven:
Plain and simple, NUMBERS talk! We put in the time to test and prove that we have developed a superior exhaust system for your Focus RS. After hours of designing and dyno testing, Injen is proud to say that the SES9004 cat-back exhaust system puts down numbers of up to 16 additional horsepower and 14 lb-ft. of torque.

Engineered and manufactured at the Injen Technology headquarters in Pomona, Ca.

Prop 65 Compliance

This product can expose you to chemicals including Chromium, Nickel & Cobalt, which are known to the State of California to cause cancer.


SES Intercooler and exhaust systems that have been installed will not be eligible for return under any circumstances. Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship. Injen Technology will replace, at no charge, any Injen product considered by Injen Technology to be defective. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology’s discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, damages caused from improper installation, nor does it cover the cost of installation or removal of the defective part or its replacement. All warranty items must be sent freight prepaid with a valid RMA (Return Merchandise Authorization) number and copy of original invoice. Most exhaust and Intercooler system installations may require a lift and or specialized tools. Due to the installation complexity of automotive exhaust and Intercooler systems, Injen Technology recommends that a qualified technician perform the installation. Most local Tuner or exhaust and muffler shops offer professional installation.

Key Features

  • Direct fit for 2016-2018 Ford Focus RS L4-2.3L Turbo
  • Injen’s Gen2 Axle Back design for the Focus RS
  • Unique and Fully Adjustable design for perfect fit and alignment
  • Dyno Proven gains of up to 16 hp and 14 lb-ft. of torque
  • Full 76MM piping made from premium 304 SS Mandrel-Bent Tubing
  • Features dual Injen Resonators to deliver a clean, crisp, distinctively Injen sound
  • Beautiful dual 4.5” black chrome exhaust tips
  • Stainless Steel Investment Cast Flange for a Fast and Easy Install
  • Hand Crafted and TIG Welded to Perfection for Strength and Durability
  • Premium Stainless Steel Hardware and Hangers for a simple install
  • No Cutting or Welding Required
  • If you're looking to improve sound, power, and looks then this is the system for you!
  • Designed and Manufactured in Pomona, CA


  • SES9004
  • SES9004
  • 843115027247
  • Injen Technology
  • New


Shipping Information

  • Item Requires Shipping
  • 45.0 lbs.
  • W19.0000” x H13.0000” x L58.0000”
  • Free Ground Shipping on orders over $200.00- 48 continental states

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.