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Cobb 3 in. Cat-Back Exhaust (15-20 EcoBoost Fastback w/o Active Exhaust)

Item 405750
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Market Price $1,204.50 You Save 9% ($109.50)
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$1,095.00 (kit)

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      Product Information

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


      • Improves Exhaust Flow for Sound and Power
      • Durable 304 Stainless Steel Construction
      • Free Flowing 3 Inch Diameter Mandrel-Bent Tubing
      • Ten-Inch Resonator and Mufflers Included
      • Four-Inch Polished Stainless Tips with Cobb Logo
      • Includes 2.25 Inch to 3 Inch Step Up Adapter
      • Compatible with Factory or Cobb 3-Inch Down Pipes
      • Not Compatible with Active Exhaust
      • Fits 2015-2020 2.3L EcoBoost Fastback Mustangs


      Power and Performance. Are you looking to enhance the power and performance of your turbocharged 2.3L Mustang? Of course you are, so check out Cobb's EcoBoost Cat-Back Exhaust System. Featuring 3 inch mandrel bent tubing to eliminate kinks, a high flow 10 inch mid pipe resonator and a pair of straight through mufflers, this Cat-Back will considerable improve your EcoBoost's exhaust flow. By improving exhaust flow you will see a noticeable increase in horse power, torque and engine response across the entire power band.

      Aggressive Throaty Sound. A Cobb Cat-Back will not only improve the power and performance of your EcoBoost Mustang, but it will also improve your Pony's sound as well. Designed to amplify the sound of your Mustangs turbocharged engine, this Cobb Cat-Back will add an aggressive throaty exhaust note without any unwanted drone via a 10 inch mid pipe resonator. This Exhaust is perfect for those EcoBoost owners who think the stock exhaust system is just too quiet and want to shake things up.

      Quality Construction. Cobb constructs their Cat-Back Exhaust from 3 inch diameter mandrel bent T304 stainless steel tubing for superior strength and long lasting corrosion resistance. The system includes a Y-pipe, 10 inch mid pipe resonator and two straight-through mufflers that end with polished dual-walled, 4 inch tips. As an added bonus the tips are etched with the Cobb logo for impressive custom styling.

      Adapter Included. This Cobb 3 inch Cat-Back can be installed with a Cobb 3 inch Down Pipe, as well as the factory 2.25 inch Down Pipe with the use of the included 2.25 inch to 3 inch step-up adapter. This adapter allows you to conveniently upgrade your EcoBoost Mustang over time as your budget allows.

      Direct Bolt-On Installation. Cobb engineered their Cat-Back to be a direct bolt-on upgrade replacement for your EcoBoost Mustang's factory exhaust system. There is no cutting or extra modifications required. Installation of this Cobb Exhaust can be completed in about a two hours with just basic hand tools.

      Application. This Cobb 3 inch Cat-Back Exhaust System is specifically designed to fit 2015-2020 Fastback EcoBoost Mustangs without the Active Valve Exhaust. Does not fit convertible models.

      Please Note. This Cat-Back Exhaust System is for use on EcoBoost Mustangs with the factory 2.25 inch down pipe or a Cobb 3 inch Down Pipe Kit installed.

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# 5M2100

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (1)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 1 customers

      Installation Time: Shop Install

      • September 11, 2018

        5 2015 EcoBoost - JohnH Installation Time: Shop Install

        Cobb downpipe with cat-back exhaust.

        Finding that right exhaust note that fits each individual's preferences is difficult, esp for a turbocharged 4 cylinder mustang. I wanted to accentuate the turbo while giving it a bit more character than factory set up. Sound clip after sound clip, I kept going back to Cobb because it sounded perfect for what the vehicle can do and the right tone for me (cause I'm the one daily driving it) and it's much louder especially paired with Cobb's 3" downpipe, making it a full turboback exhaust. From the perfectly packed boxes comes the shiny and carefully welded pieces. The beauty of the exhaust is lost underneath the car but when you hear that exhaust note, it reminds you the quality is right there below your feet, and is ready to go vroom at your command of the throttle. There is a big difference to be heard with the window open and closed. It's deep and makes the best with what it's working with. It's got growl and character, without trying to sound like a v-8, it does a good job in opening up the airflow and eliminating restrictions from intake to intercooler, upgraded charge pipes and BOV, and out the full Cobb Exhaust. Ultimately, it brings a smile to my face. Smiles per Miles...

        Helpful (7)

      Questions & Answers (1 answers)

      1 Top Rated Question

      where can i go to hear what it would sound like on my car?

      • While we do not currentlyhave a product video for this setup we would advise to check out YouTube as there may be videos to help hear this setup. 

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) 2.25-3 Inch Downpipe Adapter
      • (1) 3-Inch Y Pipe with Resonator
      • (1) Driver Side Muffler Assembly with Exhaust Tip
      • (1) Passenger Side Muffler Assembly with Exhaust Tip
      • (3) Exhaust Gaskets
      • (6) Bolts
      • (6) Nuts

      Will It Fit My Mustang

      • EcoBoost - 15, 16, 17, 18, 19, 20

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