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  See more parts for Ford Focus
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Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004
Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004 - Image 5 Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004 - Image 2 Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004 - Image 3 Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004 - Image 4 Injen SES 3" Catback Exhaust System for Ford Focus RS 2016-2018 with Dual Black Chrome Tips - SES9004 - Image 5

If you’re looking to turn your Ford Focus RS into something special, the Injen Technology catback exhaust system is worth a serious look. Unlike some competitors that skimp on quality with stepped-down tubing, this bad boy is a full 3-inch mandrel-bent unit made from top-notch 304 stainless steel. You can really feel the difference in both sound and performance.

One of the standout features of this exhaust is the use of individual resonators instead of a single muffler. This isn’t just for show; it gives your RS a unique, aggressive sound while also freeing up power across the RPM range. You’ll notice that extra kick when you hit the gas. And if you’re like me and enjoy that throaty growl, Injen’s got your back. They’ve included a custom exhaust valve bypass module, so you can enjoy that crisp sound whenever you want, without worrying about the factory valve sticking closed or open.

Now, let’s talk about the rear of the system. It’s not just functional; it’s a work of art. The multiple slip fittings mean you can adjust it to get the perfect fit right out of the box. And those dual 4-inch black chrome exhaust tips? They’re the cherry on top, giving your Focus RS a look that stands out from the crowd.

Quality Construction

This exhaust system is built to last. The 3-inch mandrel-bent 304 stainless steel tubing ensures maximum flow and durability. Every single aspect is hand TIG-welded by skilled experts right at Injen's headquarters in Pomona, California. You can trust that this isn’t just some mass-produced part; it’s crafted with care.

Exhaust Valve Bypass Module

Bypassing the factory exhaust valve means you get to enjoy that rich sound without any hiccups. The included module makes it easy to keep that valve from getting stuck at the worst possible moment.

OE Style Fitment

Installation is a breeze, thanks to the OE-style exhaust hangers that use the original bushing from your Focus RS. This design allows the system to flex just like the factory setup, which means no damage during high-stress situations. Seriously, no cutting or hassle—just straightforward installation.

Dyno Proven

And let’s get real for a second—numbers matter. After rigorous testing, Injen has shown that their SES9004 catback exhaust system can deliver up to 16 additional horsepower and 14 lb-ft of torque. That’s not just marketing fluff; it’s real performance gains you can feel.

Features

  • Dyno proven gains of up to 16 hp and 14 lb-ft of torque
  • Stainless steel investment cast flanges for quick installation
  • Handcrafted and TIG-welded for strength and durability
  • Top-tier 304 SS mandrel-bent tubing for lasting performance
  • Premium stainless steel hardware and hangers for a hassle-free install
  • Designed and manufactured in Pomona, CA, USA
  • This product is not CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California DMV

Fitment

  • Ford Focus RS 2016-2018

So, if you own a Ford Focus RS from 2016 to 2018 and are ready to unleash its true potential, the Injen SES9004 catback exhaust system could be just what you need. It’s built right, sounds amazing, and will definitely set your ride apart from the rest.

Other Part Numbers:
Injen #injSES9004

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2016-2018
 Ford Focus
2016-2018
 Ford Focus RS
Who is Injen?

Injen is highly recognized in the automotive industry. The company started in 1991 and specializes in manufacturing high-quality air induction products.  The company has become the go-to brand by multiple import tuners and has since become an automotive icon in the industry.

Years of Experience

For more than three decades, the company has created dozens of patents and thousands of new products. All of their products are dyno-tested to ensure that it provides optimum performance to the vehicle it is applied to.

Injen offers a variety of products ranging from intake systems, intercoolers, exhaust systems, and other performance parts. All their products are made out of high-quality materials and are designed by the industry’s top designers and engineers. This enables them to create products that are not only functional but adds an aesthetic value to the vehicle. Even up to now, the company never stops in improving its product. Hence, they are a favorite of tuners who wanted to have the best.

Purchase Injen Products at Vivid Racing

If you are looking for products that provide performance gains and are tried and tested, then Injen is the brand for you. They have been used by thousands of enthusiasts worldwide and have provided them high-performance products they truly deserve. The company has one of the most comprehensive lists of products that applies to most vehicles available in the market. You can never go wrong with Injen.

Visit Vivid Racing and check out their list of products that would fit your specific needs.

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INTAKE WARRANTY

Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. 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, nor does it cover the cost of installation or removal of the defective part or its replacement.

EXHAUST WARRANTY

Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. Injen Technology will replace at no charge, any exhaust system 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, nor does it cover the cost of installation or removal of the defective part or its replacement.

AIR INTAKES AND ACCESSORIES

Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. 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, 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.

SES INTERCOOLERS AND EXHAUST SYSTEMS

Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. SES Intercooler and exhaust systems that have been installed will not be eligible for return under any circumstances. Defective parts will be replaced or repaired as deemed necessary by Injen Technology. All other warranty issues will apply as indicated under the Air Intake section. 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.

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