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Roush Cat-Back Exhaust (18-20 GT Fastback w/o Active Exhaust)

Item 408119
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      Review & Installation Video

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Features Race-Inspired, Aggressive Exhaust Tones
      • Get Improved Speed and Acceleration Gains
      • Includes 2 High-Flow Mufflers
      • Features Integrated Quality Mid-Pipes and X-Pipe
      • Made From 304 Stainless Steel Materials
      • Mandrel-Bent Tubing for Consistent Airflow
      • With Quad Polished Stainless Steel Tips
      • Uses OEM Hangers and Mounting Points
      • No-Welding Installation
      • With 3-Year or 36,000-Mile Warranty
      • Manufactured in the USA
      • Fits 2018-2020 Ford Mustang Fastback GT Models Without Active Exhausts


      Get Aggressive Exhaust Sounds. This Roush Cat-Back Exhaust with Polished Tips, which is exclusively designed for AmericanMuscle, features mandrel-bent piping for better airflow. As a result, you get aggressive and deeper exhaust sounds for your Mustang GT. Moreover, this exhaust offers race-like roars and rumble outside, while still maintaining a drone-free cabin experience.

      Reliable Exhaust Performance. With this exhaust system, your Ford Mustang GT will get boosted performance and race-inspired exhaust notes. Thanks to Roush’s hours of testing and validation, this exhaust is proven to improve airflow and reduce back pressure. As a result, you get gains in horsepower and overall performance.

      Exceptional Quality. Quality will never be in question, especially when it comes to Roush’s exhaust systems. In fact, this cat-back exhaust is comprised of components that are all manufactured using high-grade, 304 stainless steel. As such, this exhaust assembly is guaranteed to be corrosion-resistant and with heavy-duty quality. The polished quad tips bring style and substance.

      No-Welding Installation. This cat-back exhaust is meant for Mustangs without active exhaust installed. The installation process is straightforward and does not need welding or complicated modifications. Mounting should be easy since the components are designed to use the OEM hangers and mounting points in the vehicle.

      Application. This Roush Cat-Back Exhaust with Polished Tips is specifically designed to fit all 2018-2020 Ford Mustang Fastback GT models without active exhausts. Roush recommends you check with your local noise ordinance levels prior to purchase.

      Fitment: 2018 2019 2020 Details

      MPN# 422093

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (9)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 9 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • September 28, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2019 GT - Johnneh Installation Time: Less than 1 Hour

        Love it

        Love my exhaust id you want to get it hands down would recommend. If you want to hear it go to the Instagram page @S550.Johnneh to hear it !

        Helpful (1)
      • September 12, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - DonaldM

        Rough cat-back

        Great product, looks great on the car and love the sound. Did installation by myself took about an hour and a half.

        Helpful (1)
      • June 02, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - 18GTPP1 Installation Time: Less than 1 Hour


        This is hands down the most aggressive, yet livable catback for my 18 GT PP1. I'm a Roush guy myself, had a catback on my 2010 GT, but for 2018, Roush took it to another level. Everything was as described and perfect

        Helpful (3)
      • May 20, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - ChrisW Installation Time: Less than 1 Hour

        Excellent addition to any 18-19 S550

        Bought this for my wife for her 18 S550. I was a little skeptical, but it was the sound she wanted. Install took under an hour on jack stands. on first start up, the cold start is brutally loud. Even louder than my S197 with LTH and full borla exhaust. It does calm down a bit after it's warm. Has a great sound and no drone. I would recommend to anyone that is looking for a quality system with no drone.

        Helpful (3)
      • April 26, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2019 GT - TravisV Installation Time: Shop Install

        Nice Sound

        Best part of this exhaust is when you're cruising there is zero drone and you can comfortably listen to music, etc. However, it's borderline waking up my neighbors when cold cranking and gets loud in a hurry when you are driving aggressively. Under normal driving it definitely is noticeable and has a great rasp to it. I have zero regrets and for the price it's a no brainer that I would buy this again.

        Helpful (1)
      • March 31, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - Damit Installation Time: Afternoon

        Really good

        These have a really nice and raspy tone. Every morning when I turn the car on the cold start they put a smile on my face. This exhaust is very loud, but you can still cruise without making too much noise. And there is no drone from this exhaust.

        Helpful (1)
      • February 18, 2019

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - GautamG Installation Time: Afternoon

        It’s worth it

        Took about 3-4 hours to install, and it sounds great.

        Helpful (1)
      • December 26, 2018

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - Kamien Installation Time: Less than 1 Hour

        Love roush cat back

        Best sound worth the money very loud beautiful sound

        Helpful (3)
      • August 25, 2018

        Review shared from Roush Cat-Back Exhaust (18-20 GT w/o Active Exhaust)

        5 2018 GT - JeremeyG Installation Time: Shop Install Installation Cost: 0-$100

        Unique exhaust sound

        This has got to be one of the best exhaust I've heard on a mustang. I love a car with a good exhaust system but this is just about the best sounding exhaust for a mustang period. The exhaust note changes as u drive so if you are light on the pedal its gonna give you a nice deep grumble. If you accelerate a little quicker you get a higher pitched sound but still deep. If your just cruising along you almost can't hear it. When you down shift you get this deep growl. This is an amazing exhaust and I can say that you will turn heads and get compliments everywhere you go.

        Helpful (15)

      Questions & Answers (15 answers)

      5 Top Rated Questions

      Will this modification cause the service engine light to turn on??

      • This will not cause a check engine light.

      Helpful (0)

      Will I need a tune with the Roush Catback? I have a 2018 PP1 GT.

      • This does not require a tune.

      Helpful (0)

      Can this go on a 2016 3.7 v6?

      • This is designed only for the 18-20 Mustang GTs. We do not recommend use on a V6, or years outside of the guaranteed fitment.

      Helpful (0)

      Just installed this system on my 19' and the mufflers and tips seem to be hanging about an inch low. Any tips on how to raise these?

      Was wondering if there is any drone with this set up?

      • Generally speaking, customers do report some drone with this system.

      Helpful (0)
      Post Your Question
      10 More Questions
      Can you get this system with the H pipe instead of the x pipe and can you get it with black tips as well? 1 answer
      I have a 2018 PP2 Gt with the active exhaust feature. The only thing I use the active feature for is to constantly turn my car back into the loudest setting, after it reverts to normal when I turn the car off. Could I purchase this kit and just do away with the active functionality. 1 answer
      Is this smog legal for California? 0 answer
      Is there anyway to get this with the roush h pipe? In a full bolt on from cats, or do you have to cut and clamp the other h pipe roush sells? 0 answer
      Any issue installing this system on my 2018 gt with the Roush supercharger kit(phase 1700hp)? 0 answer
      What size long tube headers is recommended that can fit with the roush catback? 1 answer
      What size is the tubing? 1 answer
      How much does this system weigh? 1 answer
      Will this work on the 2018 GT convertible w/o active exhaust? 1 answer
      Is this Louder than the Corsa Extreme? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) High-Flow Mufflers
      • (1) X-Pipe
      • (2) Integrated Mid-Pipes
      • (2) Stainless Steel Tips
      • Installation Hardware

      Will It Fit My Mustang

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