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Mishimoto Catted Downpipe (15-23 Mustang EcoBoost)Find parts that fit my vehicle

Item 390291
AmericanMuscle no longer carries the Mishimoto Catted Downpipe (15-23 Mustang EcoBoost). Please check out 1979-1993 Fox Body Mustang Exhaust for an updated selection.
Mishimoto Catted Downpipe (15-23 Mustang EcoBoost)
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    Product Information

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


    • Mishimoto Catted Down Pipe
    • Increases of 65 RWHP and 108 RWTQ with a Tune
    • Aggressive Exhaust Note
    • Free Flowing 3" Diameter Mandrel-Bent Tubing
    • 304 Stainless Steel Construction
    • High Flow Catalytic Converter
    • Additional O2 Bung - Ideal for Adding a Wideband Sensor
    • Includes 3" to 2.25" Step Down Adapter
    • Custom Tuning is Required
    • Intended For Off-Road, Track Use Only
    • Is NOT CARB Certified
    • Compatible with Factory or Aftermarket Cat-Back Systems
    • Fits 2015-2023 2.3L EcoBoost Mustangs


    More Power And Performance. Release all the hidden horse power and torque your Turbocharged 2.3L EcoBoost Mustang has to offer with a Mishimoto 3" Performance Catted Down Pipe. Mishitmoto has seen dyno proven power gains of 65 horse power and 108 foot pounds of torque at the rear wheels with a custom tune.

    More Aggressive Sound. A Mishimoto Down Pipe not only helps improve power and performance of your S550 EcoBoost Mustang, but it also adds a much more aggressive exhaust note when compared to the factory down pipe.

    Stainless Steel Construction. Manufactured from high quality 3" diameter 304 stainless steel tubing for superior strength and corrosion resistance, this Mishimoto Down Pipe features smooth mandrel bends throughout the entire piping to improve exhaust flow for more power and better performance.

    High Flow Cat. Mishimoto includes a high flowing catalytic converter that features a 200 cell spun metallic core that is specifically engineered for maximum flow and surface area, perfect for force inducted applications such as the turbocharged EcoBoost Mustang.

    Three O2 Bungs Built-in. Mishimoto designed their Down Pipe with three O2 bungs to accommodate the two stock O2 sensors as well as to give you the ability to easily add a wideband sensor if so desired.

    Required Upgrade. A custom tune is required for this Down Pipe. To achieve maximum power potential this Down Pipe, it is required to reprogram the vehicles computer. AmericanMuscle recommends a custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

    3" to 2.25" Adaptor Included. This Mishimoto Down Pipe can be installed onto an aftermarket 3" catback as well as the factory or an aftermarket 2.25" catback exhaust with the use of the included 3" to 2.25" step-down adapter. This adapter allows you to upgrade your EcoBoost Mustang in stages saving you money.

    Application. This Mishimoto Catted Down Pipe is designed to fit both automatic and manual 2015-2023 EcoBoost Mustang models equipped with the turbocharged 2.3L in-line 4-cylinder engine.

    Technical Note: This Mishimoto product is intended for off road use, and is not legal for use in emission restrictive states.


    CA Residents: WARNING: Cancer and Reproductive Harm -

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) 2-Piece Downpipe
    • (1) High-Flow Catalytic Converter
    • (1) 3.0" Slip Joint Clamp
    • (1) 3.0" V-Band Clamp
    • (1) 3.0" to 2.25" Exhaust Adapter

    Tech Specs

    Down Pipe Specifications
    Piping Material:304 Stainless SteelPiping Size:3" (includes 2.25" step down adapter)
    Catalytic Converter:"Yes" - Intended for off-road use onlyType Cat-Back Required:Stock, 2.25" or 3" aftermarket 
    Tune Required YesFitment:2015-2021 EcoBoost

    Customer Reviews (36)

      Questions & Answers

      10 More Questions

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