SKU: 3545414447

Injen Technology Stainless Steel Cat-Back Exhaust System (SES9004)

Sale price$636.83 Regular price$707.59
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Ships within 48 hours · Estimated delivery Aug 15 - Aug 20

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Description

Injen Technology Stainless Steel Cat-Back Exhaust System (SES9004)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

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.

Features:

  • Direct fit for 2016-2018 Ford Focus RS L4-2.3L Turbo
  • Dyno Proven gains of up to 16 hp and 14 lb-ft. of torque
  • Dual 4" black chrome bolt-on exhaust tips
  • Stainless Steel Investment Cast Flanges for a Fast and Easy Install
  • Hand Crafted and TIG-welded to Perfection for Strength and Durability
  • Dual High Flow Resonators for an Aggressive Sound and Unmatched Performance
  • Top Tier 304 SS Mandrel-Bent Tubing for lasting performance
  • Premium Stainless Steel Hardware and Hangers for a simple and hassle free install
  • Designed and Manufactured in Pomona, CA USA
  • This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3545414447

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Marielyn stephen
Natrona Heights, US
★★★★★ 5
Comfort was my main think and it gave every bit of that
My son love the color of the suit and it fit him really well. It was true to the sizing and the material is a great material.
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dawn b.
Alexandria, US
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Well-made!
Size: Large, Color: Black
Son-in-law looked very handsome in this their wedding day!
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Ivegotconfidence
Waukegan, US
★★★★★ 5
Perfect
Size: X-Large, Color: Light Grey
True Size. Fit perfectly. 5’10 200. Ordered an XL. Good quality and worth the money
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Reviewed in the United States on January 18, 2026
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Elaine Andrew
Pawtucket, US
★★★★★ 5
I would buy again!
Size: Large, Color: Burgundy
I bought this set for my son's high school graduation back in May! Came quickly, and it was exactly what we needed. It fit as described, and looked very nice during the ceremony, along w his cap n gown. Well worth the $ spent!
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Reviewed in the United States on December 10, 2025
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April Russell
San Leandro, US
★★★★★ 5
Nice
Size: Medium, Color: White
Fit well for my son, he’s 6ft and 170
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Reviewed in the United States on January 22, 2026

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